XML 25 R79.htm IDEA: XBRL DOCUMENT v2.4.1.9
Debt Financing Footnote XBRL details (Details) (USD $)
 12 Months Ended 6 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Mar. 31, 2014
Jul. 01, 2014
Sep. 30, 2014
Integer
Mar. 31, 2013
Sep. 30, 2013
Dec. 31, 2010
Sep. 30, 2010
Integer
Jun. 30, 2013
Sep. 30, 2012
Debt financing $ 345,359,000atax_DebtFinancing $ 257,274,000atax_DebtFinancing                      
Available-for-sale Securities, Fair Value Disclosure Held in Trust 378,423,092atax_AvailableForSaleSecuritiesFairValueDisclosureHeldInTrust 216,371,801atax_AvailableForSaleSecuritiesFairValueDisclosureHeldInTrust                      
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities 7,214,136us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 2,764,286us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 970,298us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities                    
Payments to Acquire Available-for-sale Securities 142,794,827us-gaap_PaymentsToAcquireAvailableForSaleSecurities 148,624,000us-gaap_PaymentsToAcquireAvailableForSaleSecurities 28,561,857us-gaap_PaymentsToAcquireAvailableForSaleSecurities                    
Derivative, Fixed Interest Rate                 3.00%us-gaap_DerivativeFixedInterestRate        
Arbors at Hickory Ridge [Member]                          
Available-for-sale Securities, Fair Value Disclosure Held in Trust 13,363,236atax_AvailableForSaleSecuritiesFairValueDisclosureHeldInTrust
/ dei_EntityByLocationAxis
= atax_ArborsAtHickoryRidgeMember		 [1] 11,801,899atax_AvailableForSaleSecuritiesFairValueDisclosureHeldInTrust
/ dei_EntityByLocationAxis
= atax_ArborsAtHickoryRidgeMember		 [2]                      
TOB Financing               7,000,000atax_TobFinancing
/ dei_EntityByLocationAxis
= atax_ArborsAtHickoryRidgeMember		          
Debt Instrument, Interest Rate, Stated Percentage 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_ArborsAtHickoryRidgeMember		 [1] 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_ArborsAtHickoryRidgeMember		 [2]                      
Available-for-sale Security, Maturity Date at a point in time Dec. 01, 2049 [1] Dec. 01, 2049 [2]                      
Autumn Pines [Member]                          
Available-for-sale Securities, Fair Value Disclosure Held in Trust   11,952,518atax_AvailableForSaleSecuritiesFairValueDisclosureHeldInTrust
/ dei_EntityByLocationAxis
= atax_AutumnPinesMember		 [2]                      
Proceeds from Sale of Available-for-sale Securities       13,100,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_AutumnPinesMember		                  
Debt Instrument, Interest Rate, Stated Percentage   5.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_AutumnPinesMember		 [2]                      
Available-for-sale Security, Maturity Date at a point in time   Oct. 01, 2046 [2]                      
Lost Creek [Member]                          
Available-for-sale Securities, Fair Value Disclosure Held in Trust   17,626,172atax_AvailableForSaleSecuritiesFairValueDisclosureHeldInTrust
/ dei_EntityByLocationAxis
= atax_LostCreekMember		 [3]               18,500,000atax_AvailableForSaleSecuritiesFairValueDisclosureHeldInTrust
/ dei_EntityByLocationAxis
= atax_LostCreekMember		      
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		                
TOB Facility [Member]                          
Number of Available for Sale Securities, Held in a Trust             4atax_NumberOfAvailableForSaleSecuritiesHeldInTrust
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacilityMember		            
Number of Collateralized Bonds             10atax_NumberofCollateralizedBonds
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacilityMember		            
TEBS II Facility [Member]                          
Debt financing 94,700,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		           94,700,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		            
Available-for-sale Securities, Fair Value Disclosure Held in Trust             118,400,000atax_AvailableForSaleSecuritiesFairValueDisclosureHeldInTrust
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		            
Short-term Debt, Percentage Bearing Fixed Interest Rate 1.40%us-gaap_ShortTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		         1.40%us-gaap_ShortTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		              
Debt Instrument, Basis Spread on Variable Rate 0.10%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		         0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		              
Debt Instrument, Total Rate of Borrowing 1.50%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		         1.50%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		              
Number of Available for Sale Securities, Held in a Trust             13atax_NumberOfAvailableForSaleSecuritiesHeldInTrust
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		            
Debt Financing, Net             91,600,000atax_DebtFinancingNet
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		            
Payments to Acquire Available-for-sale Securities             72,400,000us-gaap_PaymentsToAcquireAvailableForSaleSecurities
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		            
Restricted Cash and Cash Equivalents 6,300,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		           6,300,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		            
Derivative Asset, Notional Amount           31,600,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		              
Derivative, Fixed Interest Rate           3.00%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember		              
Derivative, Maturity Date at a point in time           Aug. 15, 2019              
TEB Facility [Member]                          
Debt financing 76,400,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TebFacilityMember		 93,000,000atax_DebtFinancing
/ 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		                      
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		                      
Number of Available for Sale Securities, Held in a Trust                     13atax_NumberOfAvailableForSaleSecuritiesHeldInTrust
/ us-gaap_DebtInstrumentAxis
= atax_TebFacilityMember		    
Restricted Cash and Cash Equivalents 1,000,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= atax_TebFacilityMember		 700,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DebtInstrumentAxis
= atax_TebFacilityMember		                      
Class A TEBS Certificates [Member] | TEB Facility [Member]                          
Debt financing     95,800,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TebFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= atax_ClassTebsCertificatesMember		                    
Class B TEBS Certificates [Member] | TEB Facility [Member]                          
Debt financing     20,300,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TebFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= atax_ClassBTebsCertificatesMember		                    
SPEARS [Member] | TOB Facility [Member]                          
Proceeds from Sale of Available-for-sale Securities, Debt             45,900,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacilityMember
/ us-gaap_DebtSecurityAxis
= atax_SpearsMember		            
LIFERS [Member] | TOB Facility [Member]                          
Proceeds from Sale of Available-for-sale Securities, Debt             26,500,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacilityMember
/ us-gaap_DebtSecurityAxis
= atax_LifersMember		            
Trust Portfolio--MBS Bonds [Member]                          
Available for Sale Securities, not Including Premiums 14,765,000atax_AvailableForSaleSecuritiesNotIncludingPremiums
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		 42,830,000atax_AvailableForSaleSecuritiesNotIncludingPremiums
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		 31,620,000atax_AvailableForSaleSecuritiesNotIncludingPremiums
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		 3,700,000atax_AvailableForSaleSecuritiesNotIncludingPremiums
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                  
Short-term Debt, Percentage Bearing Fixed Interest Rate 0.90%us-gaap_ShortTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                        
Cash Collateral for Borrowed Securities 2,100,000us-gaap_CashCollateralForBorrowedSecurities
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		 4,100,000us-gaap_CashCollateralForBorrowedSecurities
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                      
Debt Instrument, Basis Spread on Variable Rate 0.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                        
Debt Instrument, Total Rate of Borrowing 1.30%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                        
Debt, Weighted Average Interest Rate 1.10%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		 1.30%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                      
Trust Portfolio--MBS Bonds [Member] | Georgia MBS Bonds [Member]                          
Available for Sale Securities, not Including Premiums       10,000,000atax_AvailableForSaleSecuritiesNotIncludingPremiums
/ dei_EntityByLocationAxis
= atax_GeorgiaMBSBondsMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                  
Trust Portfolio--MBS Bonds [Member] | SPEARS [Member]                          
TOB Financing 34,900,000atax_TobFinancing
/ us-gaap_DebtSecurityAxis
= atax_SpearsMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                        
Trust Portfolio--MBS Bonds [Member] | SPEARS [Member] | Georgia MBS Bonds [Member]                          
TOB Financing       7,800,000atax_TobFinancing
/ us-gaap_DebtSecurityAxis
= atax_SpearsMember
/ dei_EntityByLocationAxis
= atax_GeorgiaMBSBondsMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                  
Trust Portfolio--MBS Bonds [Member] | LIFERS [Member]                          
Available for Sale Securities, not Including Premiums 9,200,000atax_AvailableForSaleSecuritiesNotIncludingPremiums
/ us-gaap_DebtSecurityAxis
= atax_LifersMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                        
TOB Financing     6,500,000atax_TobFinancing
/ us-gaap_DebtSecurityAxis
= atax_LifersMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                    
Trust Portfolio--MBS Bonds [Member] | LIFERS [Member] | Georgia MBS Bonds [Member]                          
TOB Financing       2,200,000atax_TobFinancing
/ us-gaap_DebtSecurityAxis
= atax_LifersMember
/ dei_EntityByLocationAxis
= atax_GeorgiaMBSBondsMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                  
Trading Securities [Member]                          
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] | TOB Facility-11 [Member]                          
Debt financing 34,975,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility11Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                        
TOB Financing 35,000,000atax_TobFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility11Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		           35,000,000atax_TobFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility11Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		            
Debt Instrument, Total Rate of Borrowing 4.47%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility11Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                        
Debt, Weighted Average Interest Rate             4.50%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility11Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		            
Available-for-sale Security, Maturity Date at a point in time Jul. 01, 2019           Jul. 01, 2019            
Trading Securities [Member] | TOB Facility-10 [Member]                          
Debt financing 21,850,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility10Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                        
TOB Financing 21,900,000atax_TobFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility10Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		     17,300,000atax_TobFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility10Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		     21,900,000atax_TobFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility10Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		            
Debt Instrument, Total Rate of Borrowing 4.34%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility10Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                        
Debt, Weighted Average Interest Rate             4.30%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility10Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		            
Available-for-sale Security, Maturity Date at a point in time Oct. 01, 2016           Oct. 01, 2016            
Trading Securities [Member] | TOB facility-13 [Member]                          
Debt financing 9,010,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility13Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                        
Debt Instrument, Total Rate of Borrowing 4.05%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility13Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                        
Debt, Weighted Average Interest Rate 4.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility13Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                        
Available-for-sale Security, Maturity Date at a point in time Jul. 01, 2017                        
Trading Securities [Member] | TOB facility-13 and 14 [Member]                          
Debt financing 18,000,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility13and14Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                        
Trading Securities [Member] | TOB Facility-12 [Member] [Member]                          
Debt financing 17,250,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility12MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                        
TOB Financing 17,300,000atax_TobFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility12MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		           17,300,000atax_TobFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility12MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		            
Debt Instrument, Total Rate of Borrowing 4.55%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility12MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                        
Debt, Weighted Average Interest Rate             4.60%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= atax_TOBFacility12MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		            
Available-for-sale Security, Maturity Date at a point in time Jul. 01, 2017           Jul. 01, 2017            
Trading Securities [Member] | TOB facility-9 [Member]                          
Debt financing 25,535,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility9Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		 25,750,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility9Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
TOB Financing 25,500,000atax_TobFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility9Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		 25,800,000atax_TobFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility9Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Short-term Debt, Percentage Bearing Fixed Interest Rate 1.60%us-gaap_ShortTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility9Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                        
Debt Instrument, Basis Spread on Variable Rate   0.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility9Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Debt Instrument, Total Rate of Borrowing 1.96%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility9Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		 1.96%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility9Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Available-for-sale Security, Maturity Date at a point in time Jun. 01, 2015 Dec. 01, 2014                      
Trading Securities [Member] | TOB facility-8 [Member]                          
Debt financing   13,210,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility8Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		 [4]                      
TOB Financing   13,200,000atax_TobFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility8Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Debt Instrument, Total Rate of Borrowing   2.21%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility8Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		 [4]                      
Available-for-sale Security, Maturity Date at a point in time   Oct. 01, 2014 [4]                      
Trading Securities [Member] | TOB facility-7 [Member]                          
Debt financing   20,000,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility7Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		 [5]                      
TOB Financing                       20,000,000atax_TobFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility7Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		  
Debt Instrument, Total Rate of Borrowing   2.21%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TOBfacility7Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		 [5]                      
Available-for-sale Security, Maturity Date at a point in time   Jun. 01, 2014 [5]                      
Trading Securities [Member] | TOB facility-6 [Member]                          
Debt financing   7,000,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility6Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Debt Instrument, Total Rate of Borrowing   2.40%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility6Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Available-for-sale Security, Maturity Date at a point in time   Aug. 01, 2014                      
Trading Securities [Member] | TOB facility-5 [Member]                          
Debt financing   5,700,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility5Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Debt Instrument, Total Rate of Borrowing   2.40%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility5Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Available-for-sale Security, Maturity Date at a point in time   Jun. 01, 2014                      
Trading Securities [Member] | TOB Facility-1 [Member]                          
Debt financing   9,770,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility1Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		   9,800,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility1Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		     9,800,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility1Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		            
Debt Instrument, Total Rate of Borrowing   1.96%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility1Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Available-for-sale Security, Maturity Date at a point in time   Jul. 01, 2014                      
Trading Securities [Member] | TOB facility-2 [Member]                          
Debt financing 44,675,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility2Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		 48,995,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility2Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Debt Instrument, Total Rate of Borrowing 2.20%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility2Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		 2.32%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility2Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Available-for-sale Security, Maturity Date at a point in time Jun. 01, 2015 Jun. 01, 2014                      
Public housing capital fund trusts [Member]                          
Available for Sale Securities, not Including Premiums 59,308,398atax_AvailableForSaleSecuritiesNotIncludingPremiums
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember		 65,264,703atax_AvailableForSaleSecuritiesNotIncludingPremiums
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember		 65,264,703atax_AvailableForSaleSecuritiesNotIncludingPremiums
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember		                   59,300,000atax_AvailableForSaleSecuritiesNotIncludingPremiums
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities 4,300,000us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember		                        
Cash Collateral for Borrowed Securities 400,000us-gaap_CashCollateralForBorrowedSecurities
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember		                        
Debt Instrument, Total Rate of Borrowing 2.20%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember		 2.30%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember		                      
Public housing capital fund trusts [Member] | SPEARS [Member]                          
TOB Financing 44,700,000atax_TobFinancing
/ us-gaap_DebtSecurityAxis
= atax_SpearsMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember		   49,000,000atax_TobFinancing
/ us-gaap_DebtSecurityAxis
= atax_SpearsMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember		                   49,000,000atax_TobFinancing
/ us-gaap_DebtSecurityAxis
= atax_SpearsMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Public housing capital fund trusts [Member] | LIFERS [Member]                          
TOB Financing     16,000,000atax_TobFinancing
/ us-gaap_DebtSecurityAxis
= atax_LifersMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember		                   16,000,000atax_TobFinancing
/ us-gaap_DebtSecurityAxis
= atax_LifersMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
TOB Facility [Member]                          
Debt Instrument, Total Rate of Borrowing 3.90%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TOBFacilityMember		 2.70%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TOBFacilityMember		                      
Five Points Bank [Member]                          
Line of Credit Facility, Maximum Borrowing Capacity   10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= atax_FivePointsBankMember		     5,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= atax_FivePointsBankMember		                
Line of Credit Facility, Interest Rate During Period         3.50%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_CreditFacilityAxis
= atax_FivePointsBankMember		                
Debt Instrument, Maturity Date         Mar. 01, 2015                
Bankers Trust [Member]                          
Line of Credit Facility, Interest Rate During Period         3.40%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_CreditFacilityAxis
= atax_BankersTrustMember		                
Debt Instrument, Maturity Date         Mar. 01, 2016                
Omaha State Bank [Member]                          
Debt Instrument, Interest Rate, Stated Percentage               5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CreditFacilityAxis
= atax_OmahaStateBankMember		          
Long Term Debt, Maturity date at a point in time               Jan. 25, 2014          
Line of Credit Facility, Maximum Borrowing Capacity               6,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= atax_OmahaStateBankMember		          
Mortgage Backed Securities Trusts 1 - 5 [Member] | Trust Portfolio--MBS Bonds [Member] | SPEARS [Member]                          
TOB Financing 12,000,000atax_TobFinancing
/ us-gaap_DebtSecurityAxis
= atax_SpearsMember
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecuritiesTrusts15Member
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		   25,100,000atax_TobFinancing
/ us-gaap_DebtSecurityAxis
= atax_SpearsMember
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecuritiesTrusts15Member
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                    
Available-for-sale Security, Maturity Date at a point in time Apr. 01, 2015                        
Mortgage Backed Security Trust 5 [Member] [Member] | Trust Portfolio--MBS Bonds [Member]                          
TOB Financing 5,300,000atax_TobFinancing
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust5MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		       2,500,000atax_TobFinancing
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust5MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                
Mortgage Backed Security Trust 5 [Member] [Member] | Trust Portfolio--MBS Bonds [Member] | SPEARS [Member]                          
TOB Financing         2,000,000atax_TobFinancing
/ us-gaap_DebtSecurityAxis
= atax_SpearsMember
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust5MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                
Mortgage Backed Security Trust 5 [Member] [Member] | Trust Portfolio--MBS Bonds [Member] | LIFERS [Member]                          
TOB Financing         540,000atax_TobFinancing
/ us-gaap_DebtSecurityAxis
= atax_LifersMember
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust5MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                
Mortgage Backed Security Trust 5 [Member] [Member] | Trading Securities [Member] | TOB facility-3 [Member]                          
Debt financing 5,270,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility3Member
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust5MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		 10,545,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility3Member
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust5MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Debt Instrument, Total Rate of Borrowing 1.06%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility3Member
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust5MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		 1.27%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility3Member
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust5MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Available-for-sale Security, Maturity Date at a point in time Apr. 01, 2015 Apr. 01, 2014                      
Mortgage Backed Security Trust 4 [Member] | Trust Portfolio--MBS Bonds [Member]                          
TOB Financing 6,000,000atax_TobFinancing
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust4Member
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                        
Mortgage Backed Security Trust 4 [Member] | Trading Securities [Member] | TOB facility-3 [Member]                          
Debt financing   5,960,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility3Member
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust4Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Debt Instrument, Total Rate of Borrowing   1.23%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility3Member
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust4Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Available-for-sale Security, Maturity Date at a point in time   Apr. 01, 2014                      
Mortgage Backed Security Trust 6 [Member] | Trust Portfolio--MBS Bonds [Member]                          
TOB Financing 7,800,000atax_TobFinancing
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust6Member
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                        
Mortgage Backed Security Trust 6 [Member] | Trading Securities [Member] | TOB facility-3 [Member]                          
Debt financing   7,825,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility3Member
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust6Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Debt Instrument, Total Rate of Borrowing   1.02%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility3Member
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust6Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Available-for-sale Security, Maturity Date at a point in time   Aug. 01, 2014                      
Mortgage Backed Security Trusts 4, 5, 6 [Member] | Trust Portfolio--MBS Bonds [Member]                          
TOB Financing 19,100,000atax_TobFinancing
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrusts456Member
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember		                        
Mortgage Backed Security Trust 3 [Member] | Trading Securities [Member] | TOB facility-3 [Member]                          
Debt financing   2,865,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility3Member
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust3Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		   2,900,000atax_DebtFinancing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility3Member
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust3Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                  
Debt Instrument, Total Rate of Borrowing   1.22%atax_DebtInstrumentTotalRateofBorrowing
/ us-gaap_DebtInstrumentAxis
= atax_TobFacility3Member
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust3Member
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_TradingAccountAssetsMember		                      
Available-for-sale Security, Maturity Date at a point in time   Apr. 01, 2014                      
Subsequent Event [Member] | Mortgage Backed Security Trust 5 [Member] [Member] | Trust Portfolio--MBS Bonds [Member]                          
TOB Financing 5,300,000atax_TobFinancing
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust5MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                        
Subsequent Event [Member] | Mortgage Backed Security Trust 4 [Member] | Trust Portfolio--MBS Bonds [Member]                          
TOB Financing 6,000,000atax_TobFinancing
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust4Member
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                        
Subsequent Event [Member] | Mortgage Backed Security Trust 6 [Member] | Trust Portfolio--MBS Bonds [Member]                          
TOB Financing 7,800,000atax_TobFinancing
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrust6Member
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                        
Subsequent Event [Member] | Mortgage Backed Security Trusts 4, 5, 6 [Member] | Trust Portfolio--MBS Bonds [Member]                          
TOB Financing 19,100,000atax_TobFinancing
/ atax_EntityByTrustAxis
= atax_MortgageBackedSecurityTrusts456Member
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                        
Series B [Member] | TEBS II Facility [Member]                          
Available-for-sale Securities, Fair Value Disclosure Held in Trust             $ 23,700,000atax_AvailableForSaleSecuritiesFairValueDisclosureHeldInTrust
/ us-gaap_DebtInstrumentAxis
= atax_TEBSIIFacilityMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_SeriesBMember		            
[1] (3) Bonds owned by ATAX TEBS II, LLC, Note 11
[2] Bond held by Deutsche Bank in a secured financing transaction, Note 11
[3] Bonds owned by ATAX TEBS I, LLC, Note 11
[4] Avistar at the Oaks Apartments, Avistar on the Hills Apartments, and Avistar in 09 Apartments is the collateral for the $20.0 million TOB Trust.
[5] Avistar at Chase Hill, Avistar at the Crest, and Avistar on the Boulevard is the collateral for the approximate $13.2 million TOB Trust.