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Real Estate Assets Narrative Tagging (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Unit
Jun. 30, 2013
Long-term Debt $ 57,087,320us-gaap_LongTermDebt   $ 76,707,834us-gaap_LongTermDebt  
Woodland Park [Member]        
Business Acquisition, Pro Forma Revenue 1,000,000us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= atax_WoodlandParkMember
     
Net Income (Loss) Attributable to Parent 164,000us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= atax_WoodlandParkMember
     
Real Estate Acquired Through Foreclosure 15,700,000us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_BusinessAcquisitionAxis
= atax_WoodlandParkMember
     
Maples on 97th [Member]        
Business Acquisition, Pro Forma Revenue   604,000us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= atax_MaplesOn97ThMember
   
Net Income (Loss) Attributable to Parent   235,000us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= atax_MaplesOn97ThMember
   
Business Acquisition, Effective Date of Acquisition   Aug. 29, 2012    
The 50/50 Student Housing--UNL [Member]        
Operating Leases, Rent Expense 100us-gaap_LeaseAndRentalExpense
/ dei_EntityByLocationAxis
= atax_The5050StudentHousingUNLMember
     
Number of Parking Stalls 1,605atax_NumberOfParkingStalls
/ dei_EntityByLocationAxis
= atax_The5050StudentHousingUNLMember
     
Number of Units in Real Estate Property 475us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_EntityByLocationAxis
= atax_The5050StudentHousingUNLMember
     
Third Party Contribution to Building 16,700,000atax_ThirdPartyContributionToBuilding
/ dei_EntityByLocationAxis
= atax_The5050StudentHousingUNLMember
     
Estimated Total Cost of Construction 33,800,000atax_EstimatedTotalCostOfConstruction
/ dei_EntityByLocationAxis
= atax_The5050StudentHousingUNLMember
     
Consolidated Properties [Member]        
Number of Real Estate Properties     9us-gaap_NumberOfRealEstateProperties
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
 
Limited Partner [Member] | Consolidated Properties [Member]        
Noncontrolling Interest, Ownership Percentage by Parent     99.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= us-gaap_LimitedPartnerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
 
Number of Real Estate Properties     3us-gaap_NumberOfRealEstateProperties
/ dei_LegalEntityAxis
= us-gaap_LimitedPartnerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
 
Limited Liability Company [Member]        
Noncontrolling Interest, Ownership Percentage by Parent     100.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= us-gaap_LimitedLiabilityCompanyMember
 
Number of Limited Liability Companies     6atax_NumberOfLimitedLiabilityCompanies
/ dei_LegalEntityAxis
= us-gaap_LimitedLiabilityCompanyMember
 
General Partner [Member]        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     1.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= us-gaap_GeneralPartnerMember
 
Real Estate [Member]        
Number of Real Estate Properties     9us-gaap_NumberOfRealEstateProperties
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
 
Number of Units in Real Estate Property     2,163us-gaap_NumberOfUnitsInRealEstateProperty
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
 
Long-term Debt 57,087,320us-gaap_LongTermDebt
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
  76,707,834us-gaap_LongTermDebt
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
 
Real Estate [Member] | Eagle Village [Member]        
Number of Units in Real Estate Property 511us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_EntityByLocationAxis
= atax_EagleVillageMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
  511us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_EntityByLocationAxis
= atax_EagleVillageMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
 
Long-term Debt 8,828,435us-gaap_LongTermDebt
/ dei_EntityByLocationAxis
= atax_EagleVillageMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
  8,224,671us-gaap_LongTermDebt
/ dei_EntityByLocationAxis
= atax_EagleVillageMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
 
Long Term Debt, Maturity date at a point in time Jun. 01, 2014   Sep. 01, 2015  
Real Estate [Member] | The 50/50 Student Housing--UNL [Member]        
Number of Units in Real Estate Property     475us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_EntityByLocationAxis
= atax_The5050StudentHousingUNLMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
 
Long-term Debt 7,177,438us-gaap_LongTermDebt
/ dei_EntityByLocationAxis
= atax_The5050StudentHousingUNLMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
     
Long Term Debt, Maturity date at a point in time Mar. 01, 2020      
Available-for-sale Securities [Member]        
Land     4,500,000us-gaap_Land
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AvailableforsaleSecuritiesMember
 
Available-for-sale Securities [Member] | St. Petersburg [Member]        
Land     3,000,000us-gaap_Land
/ dei_EntityByLocationAxis
= atax_St.PetersburgMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AvailableforsaleSecuritiesMember
 
Available-for-sale Securities [Member] | Kansas and California [Member]        
Land     1,500,000us-gaap_Land
/ dei_EntityByLocationAxis
= atax_KansasandCaliforniaMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AvailableforsaleSecuritiesMember
 
KANSAS | Real Estate [Member]        
Number of Real Estate Properties     1us-gaap_NumberOfRealEstateProperties
/ invest_InvestmentGeographicRegionAxis
= stpr_KS
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
 
NEBRASKA | Real Estate [Member]        
Number of Real Estate Properties     3us-gaap_NumberOfRealEstateProperties
/ invest_InvestmentGeographicRegionAxis
= stpr_NE
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
 
KENTUCKY | Real Estate [Member]        
Number of Real Estate Properties     1us-gaap_NumberOfRealEstateProperties
/ invest_InvestmentGeographicRegionAxis
= stpr_KY
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
 
INDIANA | Real Estate [Member]        
Number of Real Estate Properties     1us-gaap_NumberOfRealEstateProperties
/ invest_InvestmentGeographicRegionAxis
= stpr_IN
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
 
GEORGIA | Real Estate [Member]        
Number of Real Estate Properties     1us-gaap_NumberOfRealEstateProperties
/ invest_InvestmentGeographicRegionAxis
= stpr_GA
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
 
TEXAS | Real Estate [Member]        
Number of Real Estate Properties     2us-gaap_NumberOfRealEstateProperties
/ invest_InvestmentGeographicRegionAxis
= stpr_TX
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
 
Conventional Mortgage Loan [Member] | The 50/50 Student Housing--UNL [Member]        
Long-term Debt     25,500,000us-gaap_LongTermDebt
/ dei_EntityByLocationAxis
= atax_The5050StudentHousingUNLMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember
25,500,000us-gaap_LongTermDebt
/ dei_EntityByLocationAxis
= atax_The5050StudentHousingUNLMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConventionalLoanMember
Long Term Debt, Maturity date at a point in time     Apr. 01, 2020  
Tax Increment Financing [Member] | The 50/50 Student Housing--UNL [Member]        
Long-term Debt     4,300,000us-gaap_LongTermDebt
/ dei_EntityByLocationAxis
= atax_The5050StudentHousingUNLMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= atax_TaxIncrementFinancingMember
 
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum     4.70%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ dei_EntityByLocationAxis
= atax_The5050StudentHousingUNLMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= atax_TaxIncrementFinancingMember
 
Long Term Debt, Maturity date at a point in time     Jan. 01, 2019  
Tax Increment Financing [Member] | Real Estate [Member] | The 50/50 Student Housing--UNL [Member]        
Long-term Debt     $ 4,299,990us-gaap_LongTermDebt
/ dei_EntityByLocationAxis
= atax_The5050StudentHousingUNLMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= atax_TaxIncrementFinancingMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember
 
Long Term Debt, Maturity date at a point in time     Dec. 01, 2019