Amendment Flag Amendment Flag Annual Fund Operating Expenses Table [Text Block] Annual Fund Operating Expenses [Table] Annual Return 2002 Annual Return 2002 Annual Return 2003 Annual Return 2003 Annual Return 2004 Annual Return 2004 Annual Return 2005 Annual Return 2005 Annual Return 2006 Annual Return 2006 Annual Return 2007 Annual Return 2007 Annual Return 2008 Annual Return 2008 Annual Return 2009 Annual Return 2009 Annual Return 2010 Annual Return 2010 Annual Return 2011 Annual Return 2011 Average Annual Return [Abstract] Average Annual Return: Average Annual Return Caption Caption Average Annual Return Inception Date Inception Date Average Annual Return Since Inception Since Inception Average Annual Return Year 01 1 Year Average Annual Return Year 05 5 Years Average Annual Return Year 10 10 Years Bar Chart And Performance Table Heading Bar Chart and Performance Table [Heading] Bar Chart Closing [Text Block] Bar Chart Closing [Text Block] Bar Chart Heading Bar Chart [Heading] Bar Chart Highest Quarterly Return Highest Quarterly Return Bar Chart Highest Quarterly Return Date Highest Quarterly Return, Date Bar Chart Lowest Quarterly Return Lowest Quarterly Return Bar Chart Lowest Quarterly Return Date Lowest Quarterly Return, Date Bar Chart Table [Abstract] Bar Chart Table: Bar Chart Table [Text Block] Bar Chart [Table] Bar Chart Year To Date Return Bar Chart, Year to Date Return Bar Chart Year To Date Return Date Bar Chart, Year to Date Return, Date Government Series C 000019836 [Member] Government Series SNAP(R) Fund Class C 000019838 [Member] SNAP(R) Fund Class Institutional Class C 000069120 [Member] Institutional Class Independent Schools and Colleges Class Shares C 000078475 [Member] Independent Schools and Colleges Class Shares Colorado Investors Class C 000104338 [Member] Colorado Investors Class Component 1 Other Expenses Over Assets Transfer agent fees Component 2 Other Expenses Over Assets Other operating expenses Distribution And Service 12 b 1 Fees Over Assets Distribution (12b-1) fees Document Creation Date Document Creation Date Document [Domain] Prospectus Document Effective Date Document Effective Date Document Information Document [Axis] Document [Axis] Document Period End Date Document Period End Date Document Type Document Type Entity Central Index Key Central Index Key Entity [Domain] Series Entity Registrant Name Registrant Name This Closing Text Block is to include information not included in the Expenses Narrative. Expense Closing [Text Block] Operating Expense, Closing Expense Example [Abstract] Expense Example: Expense Example By Year Caption Expense Example by, Year, Caption [Text] Expense Example Heading Expense Example [Heading] Expense Example Narrative [Text Block] Expense Example Narrative [Text Block] Expense Example With Redemption Table [Text Block] Expense Example, With Redemption [Table] Expense Example Year 01 Expense Example, with Redemption, 1 Year Expense Example Year 03 Expense Example, with Redemption, 3 Years Expense Example Year 05 Expense Example, with Redemption, 5 Years Expense Example Year 10 Expense Example, with Redemption, 10 Years Expense Heading Expense [Heading] Expense Narrative [Text Block] Expense Narrative [Text Block] Expenses Over Assets Total Annual Fund Operating Expenses Fee Waiver Or Reimbursement Over Assets Less: Fee Waivers Fee Waiver Or Reimbursement Over Assets Date Of Termination Fee Waiver or Reimbursement over Assets, Date of Termination Highest Quarterly Return Label Highest Quarterly Return, Label Legal Entity [Axis] Series [Axis] Lowest Quarterly Return Label Lowest Quarterly Return, Label Management Fees Over Assets Management fees Net Expenses Over Assets Net Annual Fund Operating Expenses Objective Heading Objective [Heading] Objective Primary [Text Block] Objective, Primary [Text Block] Operating Expenses [Abstract] Operating Expenses: Operating Expenses Caption Operating Expenses Caption [Text] Other Expenses Over Assets Other expenses: Performance Availability Phone Performance Availability Phone [Text] Performance Information Illustrates Variability Of Returns Performance Information Illustrates Variability of Returns [Text] Performance Narrative [Text Block] Performance Narrative [Text Block] Performance Past Does Not Indicate Future Performance Past Does Not Indicate Future [Text] Performance Table [Text Block] Performance [Table] Prospectus Date ProspectusDate Prospectus Share Class [Axis] Share Class [Axis] Prospectus [Table] Prospectus: Risk Heading Risk [Heading] Risk Lose Money Risk Lose Money [Text] Risk Narrative [Text Block] Risk Narrative [Text Block] Risk Not Insured Depository Institution Risk Not Insured Depository Institution [Text] Risk Return [Abstract] Risk/Return: Risk Return Heading Risk/Return [Heading] Government Series S 000007237 [Member] Government Series Prime Series S 000007238 [Member] Prime Series Share Class [Domain] Share Classes Strategy Heading Strategy [Heading] Strategy Narrative [Text Block] Strategy Narrative [Text Block] Government Series (Prospectus Summary) Summary S 000007237 [Member] Government Series (Prospectus Summary) Prime Series (First Prospectus Summary) Summary S 000007238 - 1 [Member] Prime Series (First Prospectus Summary) Prime Series (Second Prospectus Summary) Summary S 000007238 - 2 [Member] Prime Series (Second Prospectus Summary) Prime Series (Third Prospectus Summary) Summary S 000007238 - 3 [Member] Prime Series (Third Prospectus Summary) Prime Series (Fourth Prospectus Summary) Summary S 000007238 - 4 [Member] Prime Series (Fourth Prospectus Summary) Year To Date Return Label Year to Date Return, Label