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Subsequent Events Subsequent Events Footnote Tagging (Details) (USD $)
 12 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2014
Jun. 30, 2014
Sep. 30, 2014
Mar. 31, 2015
Sep. 30, 2013
Dec. 31, 2010
Sep. 30, 2010
Integer
Subsequent Event [Line Items]                    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust $ 338,861,752atax_AvailableForSaleSecuritiesAmortizedCostBasisHeldInTrust $ 219,511,490atax_AvailableForSaleSecuritiesAmortizedCostBasisHeldInTrust                
Available-for-sale Securities, Gross Realized Gain (Loss) (2,413,713)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet (651,849)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet                
Debt financing 345,359,000atax_DebtFinancing 257,274,000atax_DebtFinancing                
Available-for-sale Securities 70,601,045us-gaap_AvailableForSaleSecurities 68,946,370us-gaap_AvailableForSaleSecurities                
Derivative, Fixed Interest Rate               3.00%us-gaap_DerivativeFixedInterestRate    
Restricted cash debt collateral 1,699,973atax_RestrictedCashDebtCollateral (3,992,848)atax_RestrictedCashDebtCollateral 7,247,341atax_RestrictedCashDebtCollateral              
Lost Creek [Member]                    
Subsequent Event [Line Items]                    
Proceeds from Sale of Available-for-sale Securities       18,700,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_LostCreekMember		 18,700,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_LostCreekMember		          
Available-for-sale Securities, Amortized Cost Basis, Held in Trust   15,883,084atax_AvailableForSaleSecuritiesAmortizedCostBasisHeldInTrust
/ dei_EntityByLocationAxis
= atax_LostCreekMember		 [1]             15,900,000atax_AvailableForSaleSecuritiesAmortizedCostBasisHeldInTrust
/ dei_EntityByLocationAxis
= atax_LostCreekMember		  
Available-for-sale Securities, Gross Realized Gain (Loss)       2,800,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ dei_EntityByLocationAxis
= atax_LostCreekMember		            
Harden Ranch [Member]                    
Subsequent Event [Line Items]                    
Number of Units in Real Estate Property       100us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_EntityByLocationAxis
= atax_HardenRanchMember		            
Decatur-Angle [Member]                    
Subsequent Event [Line Items]                    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 23,000,000atax_AvailableForSaleSecuritiesAmortizedCostBasisHeldInTrust
/ dei_EntityByLocationAxis
= atax_DecaturAngleMember		 [2]                  
Available-for-sale Securities       23,000,000us-gaap_AvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_DecaturAngleMember		            
Number of Units in Real Estate Property       302us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_EntityByLocationAxis
= atax_DecaturAngleMember		            
Debt Instrument, Interest Rate, Stated Percentage 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_DecaturAngleMember		 [2]     5.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_DecaturAngleMember		            
Available-for-sale Security, Maturity Date at a point in time Jan. 01, 2054 [2]     Jan. 01, 2054            
TEB Facility [Member]                    
Subsequent Event [Line Items]                    
Debt financing 76,400,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TebFacilityMember		 93,000,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TebFacilityMember		                
Debt, Weighted Average Interest Rate 2.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= atax_TebFacilityMember		 2.03%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= atax_TebFacilityMember		                
Debt Instrument, Interest Rate, Stated Percentage 0.07%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= atax_TebFacilityMember		 0.13%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= atax_TebFacilityMember		                
Number of Available for Sale Securities, Held in a Trust                   13atax_NumberOfAvailableForSaleSecuritiesHeldInTrust
/ us-gaap_DebtInstrumentAxis
= atax_TebFacilityMember
Series A [Member] | Lost Creek [Member]                    
Subsequent Event [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage   6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_LostCreekMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesAMember		                
Available-for-sale Security, Maturity Date at a point in time   Jun. 01, 2041                
Series A [Member] | Harden Ranch [Member]                    
Subsequent Event [Line Items]                    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 6,960,000atax_AvailableForSaleSecuritiesAmortizedCostBasisHeldInTrust
/ dei_EntityByLocationAxis
= atax_HardenRanchMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesAMember		 [3]                  
Available-for-sale Securities       7,000,000us-gaap_AvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_HardenRanchMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesAMember		            
Debt Instrument, Interest Rate, Stated Percentage 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_HardenRanchMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesAMember		 [3]     5.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_HardenRanchMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesAMember		            
Available-for-sale Security, Maturity Date at a point in time Mar. 01, 2030 [3]     Mar. 01, 2030            
Series B [Member] | Harden Ranch [Member]                    
Subsequent Event [Line Items]                    
Available-for-sale Securities 2,338,499us-gaap_AvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_HardenRanchMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesBMember		     2,300,000us-gaap_AvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_HardenRanchMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesBMember		            
Debt Instrument, Interest Rate, Stated Percentage 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_HardenRanchMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesBMember		         5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_HardenRanchMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesBMember		 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_HardenRanchMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesBMember		      
Available-for-sale Security, Maturity Date at a point in time Mar. 01, 2016     Mar. 01, 2016            
SMBC Capital Markets, Inc [Member]                    
Subsequent Event [Line Items]                    
Derivative Asset, Notional Amount           41,250,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_CounterpartyNameAxis
= atax_SMBCCapitalMarketsIncMember		        
Derivative, Fixed Interest Rate           1.00%us-gaap_DerivativeFixedInterestRate
/ us-gaap_CounterpartyNameAxis
= atax_SMBCCapitalMarketsIncMember		        
Derivative, Maturity Date at a point in time           Mar. 01, 2017        
Deriviative at purchase price           230,500atax_DeriviativeAtPurchasePrice
/ us-gaap_CounterpartyNameAxis
= atax_SMBCCapitalMarketsIncMember		        
Subsequent Event [Member] | Concord at Gulfgate [Member]                    
Subsequent Event [Line Items]                    
Number of Units in Real Estate Property             288us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_EntityByLocationAxis
= atax_ConcordatGulfgateMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Subsequent Event [Member] | Concord at Little York [Member]                    
Subsequent Event [Line Items]                    
Number of Units in Real Estate Property             276us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_EntityByLocationAxis
= atax_ConcordatLittleYorkMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Subsequent Event [Member] | Concord at Williamcrest [Member]                    
Subsequent Event [Line Items]                    
Number of Units in Real Estate Property             288us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_EntityByLocationAxis
= atax_ConcordatWilliamcrestMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Subsequent Event [Member] | Concord Portfolio [Member]                    
Subsequent Event [Line Items]                    
Number of Available for Sale Securities, Held in a Trust             3atax_NumberOfAvailableForSaleSecuritiesHeldInTrust
/ dei_EntityByLocationAxis
= atax_ConcordPortfolioMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Subsequent Event [Member] | Series A [Member] | Concord at Gulfgate [Member]                    
Subsequent Event [Line Items]                    
Available-for-sale Securities             17,100,000us-gaap_AvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_ConcordatGulfgateMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesAMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Subsequent Event [Member] | Series A [Member] | Concord at Little York [Member]                    
Subsequent Event [Line Items]                    
Available-for-sale Securities             12,500,000us-gaap_AvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_ConcordatLittleYorkMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesAMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Subsequent Event [Member] | Series A [Member] | Concord at Williamcrest [Member]                    
Subsequent Event [Line Items]                    
Available-for-sale Securities             18,000,000us-gaap_AvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_ConcordatWilliamcrestMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesAMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Subsequent Event [Member] | Series A [Member] | Concord Portfolio [Member]                    
Subsequent Event [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage             6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_ConcordPortfolioMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesAMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Debt Instrument, Maturity Date             Feb. 01, 2032      
Subsequent Event [Member] | Series B [Member] | Concord at Gulfgate [Member]                    
Subsequent Event [Line Items]                    
Available-for-sale Securities             2,100,000us-gaap_AvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_ConcordatGulfgateMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesBMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Subsequent Event [Member] | Series B [Member] | Concord at Little York [Member]                    
Subsequent Event [Line Items]                    
Available-for-sale Securities             1,000,000us-gaap_AvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_ConcordatLittleYorkMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesBMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Subsequent Event [Member] | Series B [Member] | Concord at Williamcrest [Member]                    
Subsequent Event [Line Items]                    
Available-for-sale Securities             2,800,000us-gaap_AvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_ConcordatWilliamcrestMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesBMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Subsequent Event [Member] | Series B [Member] | Concord Portfolio [Member]                    
Subsequent Event [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage             12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_ConcordPortfolioMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesBMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Debt Instrument, Maturity Date             Mar. 01, 2032      
Trading Securities [Member]                    
Subsequent Event [Line Items]                    
Debt financing 174,250,000atax_DebtFinancing
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		 164,295,000atax_DebtFinancing
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                
Trading Securities [Member] | Subsequent Event [Member]                    
Subsequent Event [Line Items]                    
Restricted cash debt collateral             6,600,000atax_RestrictedCashDebtCollateral
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Trading Securities [Member] | Subsequent Event [Member] | TOB facility-15 [Member]                    
Subsequent Event [Line Items]                    
Debt financing             33,300,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility15Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Debt, Weighted Average Interest Rate             2.80%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility15Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Available-for-sale Security, Maturity Date at a point in time             Feb. 19, 2018      
[1] Bonds owned by ATAX TEBS I, LLC, Note 11
[2] Bond held by Deutsche Bank in a secured financing transaction, Note 11
[3] (3) Bonds owned by ATAX TEBS II, LLC, Note 11