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Schedule - Expense Example, No Redemption {Transposed} - ULTRA-SHORT FIXED INCOME FUND link:presentationLink link:calculationLink link:definitionLink 000256 - Schedule - Annual Total Returns - ULTRA-SHORT FIXED INCOME FUND [BarChart] link:presentationLink link:calculationLink link:definitionLink 000257 - Schedule - Average Annual Total Returns {Transposed} {- ULTRA-SHORT FIXED INCOME FUND} link:presentationLink link:calculationLink link:definitionLink 000258 - Document - Risk/Return Detail {Unlabeled} - ULTRA-SHORT FIXED INCOME FUND link:presentationLink link:calculationLink link:definitionLink 000259 - Disclosure - Risk/Return Detail Data {Elements} - ULTRA-SHORT FIXED INCOME FUND link:presentationLink link:calculationLink link:definitionLink 000261 - Document - Risk/Return Summary {Unlabeled} - U.S. GOVERNMENT FUND link:presentationLink link:calculationLink link:definitionLink 000262 - Schedule - Shareholder Fees {- U.S. GOVERNMENT FUND} link:presentationLink link:calculationLink link:definitionLink 000263 - Schedule - Annual Fund Operating Expenses {- U.S. GOVERNMENT FUND} link:presentationLink link:calculationLink link:definitionLink 000264 - Schedule - Expense Example {Transposed} {- U.S. GOVERNMENT FUND} link:presentationLink link:calculationLink link:definitionLink 000265 - Schedule - Expense Example, No Redemption {Transposed} - U.S. GOVERNMENT FUND link:presentationLink link:calculationLink link:definitionLink 000266 - Schedule - Annual Total Returns - U.S. GOVERNMENT FUND [BarChart] link:presentationLink link:calculationLink link:definitionLink 000267 - Schedule - Average Annual Total Returns {Transposed} {- U.S. GOVERNMENT FUND} link:presentationLink link:calculationLink link:definitionLink 000268 - Document - Risk/Return Detail {Unlabeled} - U.S. GOVERNMENT FUND link:presentationLink link:calculationLink link:definitionLink 000269 - Disclosure - Risk/Return Detail Data {Elements} - U.S. GOVERNMENT FUND link:presentationLink link:calculationLink link:definitionLink 000271 - Document - Risk/Return Summary {Unlabeled} - ARIZONA TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000272 - Schedule - Shareholder Fees {- ARIZONA TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000273 - Schedule - Annual Fund Operating Expenses {- ARIZONA TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000274 - Schedule - Expense Example {Transposed} {- ARIZONA TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000275 - Schedule - Expense Example, No Redemption {Transposed} {- ARIZONA TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000276 - Schedule - Annual Total Returns - ARIZONA TAX-EXEMPT FUND [BarChart] link:presentationLink link:calculationLink link:definitionLink 000277 - Schedule - Average Annual Total Returns {Transposed} {- ARIZONA TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000278 - Document - Risk/Return Detail {Unlabeled} {- ARIZONA TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000279 - Disclosure - Risk/Return Detail Data {Elements} - ARIZONA TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000281 - Document - Risk/Return Summary {Unlabeled} - CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000282 - Schedule - Shareholder Fees {- CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000283 - Schedule - Annual Fund Operating Expenses {- CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000284 - Schedule - Expense Example {Transposed} {- CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000285 - Schedule - Expense Example, No Redemption {Transposed} - CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000286 - Schedule - Annual Total Returns - CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND [BarChart] link:presentationLink link:calculationLink link:definitionLink 000287 - Schedule - Average Annual Total Returns {Transposed} {- CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000288 - Document - Risk/Return Detail {Unlabeled} - CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000289 - Disclosure - Risk/Return Detail Data {Elements} - CALIFORNIA INTERMEDIATE TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000291 - Document - Risk/Return Summary {Unlabeled} - CALIFORNIA TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000292 - Schedule - Shareholder Fees {- CALIFORNIA TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000293 - Schedule - Annual Fund Operating Expenses {- CALIFORNIA TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000294 - Schedule - Expense Example {Transposed} {- CALIFORNIA TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000295 - Schedule - Expense Example, No Redemption {Transposed} {- CALIFORNIA TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000296 - Schedule - Annual Total Returns - CALIFORNIA TAX-EXEMPT FUND [BarChart] link:presentationLink link:calculationLink link:definitionLink 000297 - Schedule - Average Annual Total Returns {Transposed} {- CALIFORNIA TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000298 - Document - Risk/Return Detail {Unlabeled} - CALIFORNIA TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000299 - Disclosure - Risk/Return Detail Data {Elements} - CALIFORNIA TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000301 - Document - Risk/Return Summary {Unlabeled} - HIGH YIELD MUNICIPAL FUND link:presentationLink link:calculationLink link:definitionLink 000302 - Schedule - Shareholder Fees {- HIGH YIELD MUNICIPAL FUND} link:presentationLink link:calculationLink link:definitionLink 000303 - Schedule - Annual Fund Operating Expenses {- HIGH YIELD MUNICIPAL FUND} link:presentationLink link:calculationLink link:definitionLink 000304 - Schedule - Expense Example {Transposed} {- HIGH YIELD MUNICIPAL FUND} link:presentationLink link:calculationLink link:definitionLink 000305 - Schedule - Expense Example, No Redemption {Transposed} - HIGH YIELD MUNICIPAL FUND link:presentationLink link:calculationLink link:definitionLink 000306 - Schedule - Annual Total Returns {- HIGH YIELD MUNICIPAL FUND [BarChart]} link:presentationLink link:calculationLink link:definitionLink 000307 - Schedule - Average Annual Total Returns {Transposed} {- HIGH YIELD MUNICIPAL FUND} link:presentationLink link:calculationLink link:definitionLink 000308 - Document - Risk/Return Detail {Unlabeled} - HIGH YIELD MUNICIPAL FUND link:presentationLink link:calculationLink link:definitionLink 000309 - Disclosure - Risk/Return Detail Data {Elements} - HIGH YIELD MUNICIPAL FUND link:presentationLink link:calculationLink link:definitionLink 000311 - Document - Risk/Return Summary {Unlabeled} - INTERMEDIATE TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000312 - Schedule - Shareholder Fees {- INTERMEDIATE TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000313 - Schedule - Annual Fund Operating Expenses {- INTERMEDIATE TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000314 - Schedule - Expense Example {Transposed} {- INTERMEDIATE TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000315 - Schedule - Expense Example, No Redemption {Transposed} - INTERMEDIATE TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000316 - Schedule - Annual Total Returns {- INTERMEDIATE TAX-EXEMPT FUND [BarChart]} link:presentationLink link:calculationLink link:definitionLink 000317 - Schedule - Average Annual Total Returns {Transposed} {- INTERMEDIATE TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000318 - Document - Risk/Return Detail {Unlabeled} - INTERMEDIATE TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000319 - Disclosure - Risk/Return Detail Data {Elements} - INTERMEDIATE TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000321 - Document - Risk/Return Summary {Unlabeled} - SHORT-INTERMEDIATE TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000322 - Schedule - Shareholder Fees {- SHORT-INTERMEDIATE TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000323 - Schedule - Annual Fund Operating Expenses {- SHORT-INTERMEDIATE TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000324 - Schedule - Expense Example {Transposed} {- SHORT-INTERMEDIATE TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000325 - Schedule - Expense Example, No Redemption {Transposed} - SHORT-INTERMEDIATE TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000326 - Schedule - Annual Total Returns - SHORT-INTERMEDIATE TAX-EXEMPT FUND [BarChart] link:presentationLink link:calculationLink link:definitionLink 000327 - Schedule - Average Annual Total Returns {Transposed} {- SHORT-INTERMEDIATE TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000328 - Document - Risk/Return Detail {Unlabeled} - SHORT-INTERMEDIATE TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000329 - Disclosure - Risk/Return Detail Data {Elements} - SHORT-INTERMEDIATE TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000331 - Document - Risk/Return Summary {Unlabeled} - TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000332 - Schedule - Shareholder Fees {- TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000333 - Schedule - Annual Fund Operating Expenses {- TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000334 - Schedule - Expense Example {Transposed} {- TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000335 - Schedule - Expense Example, No Redemption {Transposed} {- TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000336 - Schedule - Annual Total Returns - TAX-EXEMPT FUND [BarChart] link:presentationLink link:calculationLink link:definitionLink 000337 - Schedule - Average Annual Total Returns {Transposed} {- TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000338 - Document - Risk/Return Detail {Unlabeled} {- TAX-EXEMPT FUND} link:presentationLink link:calculationLink link:definitionLink 000339 - Disclosure - Risk/Return Detail Data {Elements} - TAX-EXEMPT FUND link:presentationLink link:calculationLink link:definitionLink 000341 - Document - Risk/Return Summary {Unlabeled} - CALIFORNIA MUNICIPAL MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000342 - Schedule - Shareholder Fees {- CALIFORNIA MUNICIPAL MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000343 - Schedule - Annual Fund Operating Expenses {- CALIFORNIA MUNICIPAL MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000344 - Schedule - Expense Example {Transposed} {- CALIFORNIA MUNICIPAL MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000345 - Schedule - Expense Example, No Redemption {Transposed} - CALIFORNIA MUNICIPAL MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000346 - Schedule - Annual Total Returns - CALIFORNIA MUNICIPAL MONEY MARKET FUND [BarChart] link:presentationLink link:calculationLink link:definitionLink 000347 - Schedule - Average Annual Total Returns {Transposed} {- CALIFORNIA MUNICIPAL MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000348 - Document - Risk/Return Detail {Unlabeled} - CALIFORNIA MUNICIPAL MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000349 - Disclosure - Risk/Return Detail Data {Elements} - CALIFORNIA MUNICIPAL MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000351 - Document - Risk/Return Summary {Unlabeled} - MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000352 - Schedule - Shareholder Fees {- MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000353 - Schedule - Annual Fund Operating Expenses {- MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000354 - Schedule - Expense Example {Transposed} {- MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000355 - Schedule - Expense Example, No Redemption {Transposed} - MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000356 - Schedule - Annual Total Returns - MONEY MARKET FUND [BarChart] link:presentationLink link:calculationLink link:definitionLink 000357 - Schedule - Average Annual Total Returns {Transposed} {- MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000358 - Document - Risk/Return Detail {Unlabeled} - MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000359 - Disclosure - Risk/Return Detail Data {Elements} - MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000361 - Document - Risk/Return Summary {Unlabeled} - MUNICIPAL MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000362 - Schedule - Shareholder Fees {- MUNICIPAL MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000363 - Schedule - Annual Fund Operating Expenses {- MUNICIPAL MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000364 - Schedule - Expense Example {Transposed} {- MUNICIPAL MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000365 - Schedule - Expense Example, No Redemption {Transposed} - MUNICIPAL MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000366 - Schedule - Annual Total Returns - MUNICIPAL MONEY MARKET FUND [BarChart] link:presentationLink link:calculationLink link:definitionLink 000367 - Schedule - Average Annual Total Returns {Transposed} {- MUNICIPAL MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000368 - Document - Risk/Return Detail {Unlabeled} - MUNICIPAL MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000369 - Disclosure - Risk/Return Detail Data {Elements} - MUNICIPAL MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000371 - Document - Risk/Return Summary {Unlabeled} - U.S. GOVERNMENT MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000372 - Schedule - Shareholder Fees {- U.S. GOVERNMENT MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000373 - 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Document - Risk/Return Summary {Unlabeled} - U.S. GOVERNMENT SELECT MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000382 - Schedule - Shareholder Fees {- U.S. GOVERNMENT SELECT MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000383 - Schedule - Annual Fund Operating Expenses {- U.S. GOVERNMENT SELECT MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000384 - Schedule - Expense Example {Transposed} {- U.S. GOVERNMENT SELECT MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000385 - Schedule - Expense Example, No Redemption {Transposed} - U.S. GOVERNMENT SELECT MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000386 - Schedule - Annual Total Returns - U.S. GOVERNMENT SELECT MONEY MARKET FUND [BarChart] link:presentationLink link:calculationLink link:definitionLink 000387 - Schedule - Average Annual Total Returns {Transposed} {- U.S. GOVERNMENT SELECT MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000388 - Document - Risk/Return Detail {Unlabeled} - U.S. GOVERNMENT SELECT MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000389 - Disclosure - Risk/Return Detail Data {Elements} - U.S. GOVERNMENT SELECT MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000391 - Document - Risk/Return Summary {Unlabeled} - INVESTORS MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000392 - Schedule - Shareholder Fees {- INVESTORS MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000393 - Schedule - Annual Fund Operating Expenses {- INVESTORS MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000394 - Schedule - Expense Example {Transposed} {- INVESTORS MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000395 - Schedule - Expense Example, No Redemption {Transposed} - INVESTORS MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000396 - Schedule - Annual Total Returns - INVESTORS MONEY MARKET FUND [BarChart] link:presentationLink link:calculationLink link:definitionLink 000397 - Schedule - Average Annual Total Returns {Transposed} - INVESTORS MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000398 - Document - Risk/Return Detail {Unlabeled} - INVESTORS MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000399 - Disclosure - Risk/Return Detail Data {Elements} - INVESTORS MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000401 - Document - Risk/Return Summary {Unlabeled} - INVESTORS AMT-FREE MUNICIPAL MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000402 - Schedule - Shareholder Fees {- INVESTORS AMT-FREE MUNICIPAL MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000403 - Schedule - Annual Fund Operating Expenses {- INVESTORS AMT-FREE MUNICIPAL MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000404 - Schedule - Expense Example {Transposed} {- INVESTORS AMT-FREE MUNICIPAL MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000405 - Schedule - Expense Example, No Redemption {Transposed} - INVESTORS AMT-FREE MUNICIPAL MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000406 - Schedule - Annual Total Returns - INVESTORS AMT-FREE MUNICIPAL MONEY MARKET FUND [BarChart] link:presentationLink link:calculationLink link:definitionLink 000407 - Schedule - Average Annual Total Returns {Transposed} - INVESTORS AMT-FREE MUNICIPAL MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000408 - Document - Risk/Return Detail {Unlabeled} - INVESTORS AMT-FREE MUNICIPAL MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000409 - Disclosure - Risk/Return Detail Data {Elements} - INVESTORS AMT-FREE MUNICIPAL MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000411 - Document - Risk/Return Summary {Unlabeled}- INVESTORS U.S. GOVERNMENT MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000412 - Schedule - Shareholder Fees {- INVESTORS U.S. GOVERNMENT MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000413 - Schedule - Annual Fund Operating Expenses{ - INVESTORS U.S. GOVERNMENT MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000414 - Schedule - Expense Example {Transposed}{ - INVESTORS U.S. GOVERNMENT MONEY MARKET FUND} link:presentationLink link:calculationLink link:definitionLink 000415 - Schedule - Expense Example, No Redemption {Transposed} - INVESTORS U.S. GOVERNMENT MONEY MARKET FUND link:presentationLink link:calculationLink link:definitionLink 000416 - Schedule - Annual Total Returns - INVESTORS U.S. GOVERNMENT MONEY MARKET FUND [BarChart] link:presentationLink link:calculationLink link:definitionLink 000417 - Schedule - Average Annual Total Returns {Transposed} - 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