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Variable Interest Entities Property Asset Carrying Value and Maximum Exposure (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Available-for-sale Securities [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure $ 67,095,817atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 $ 24,754,297atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Available for Sale Security and Property Loan Receivable, Carrying Value 70,124,638atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 26,234,563atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Property Loan [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 11,062,617atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		 10,580,372atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember
Available for Sale Security and Property Loan Receivable, Carrying Value 5,010,615atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		 4,930,615atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember
Ashley Square [Member] | Available-for-sale Securities [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 5,159,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_AshleySquareMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 5,212,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_AshleySquareMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Available for Sale Security and Property Loan Receivable, Carrying Value 5,645,559atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_AshleySquareMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 5,212,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_AshleySquareMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Ashley Square [Member] | Property Loan [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 7,534,002atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_AshleySquareMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		 7,131,757atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_AshleySquareMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember
Available for Sale Security and Property Loan Receivable, Carrying Value 1,482,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_AshleySquareMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		 1,482,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_AshleySquareMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember
Bruton Apts [Member] | Available-for-sale Securities [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 18,145,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_BrutonAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		  
Available for Sale Security and Property Loan Receivable, Carrying Value 18,145,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_BrutonAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		  
Bruton Apts [Member] | Property Loan [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_BrutonAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		  
Available for Sale Security and Property Loan Receivable, Carrying Value 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_BrutonAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		  
Glenview Apts [Member] | Available-for-sale Securities [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 6,723,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_GlenviewAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		  
Available for Sale Security and Property Loan Receivable, Carrying Value 6,723,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_GlenviewAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		  
Glenview Apts [Member] | Property Loan [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_GlenviewAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		  
Available for Sale Security and Property Loan Receivable, Carrying Value 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_GlenviewAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		  
Harden Ranch [Member] | Available-for-sale Securities [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 9,300,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_HardenRanchMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		  
Available for Sale Security and Property Loan Receivable, Carrying Value 9,300,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_HardenRanchMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		  
Harden Ranch [Member] | Property Loan [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_HardenRanchMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		  
Available for Sale Security and Property Loan Receivable, Carrying Value 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_HardenRanchMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		  
Montclair Apts [Member] | Available-for-sale Securities [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 3,458,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_MontclairAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		  
Available for Sale Security and Property Loan Receivable, Carrying Value 3,458,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_MontclairAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		  
Montclair Apts [Member] | Property Loan [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_MontclairAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		  
Available for Sale Security and Property Loan Receivable, Carrying Value 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_MontclairAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		  
Cross Creek [Member] | Available-for-sale Securities [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 6,074,817atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_CrossCreekMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 6,042,297atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_CrossCreekMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Available for Sale Security and Property Loan Receivable, Carrying Value 8,617,079atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_CrossCreekMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 7,522,563atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_CrossCreekMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Cross Creek [Member] | Property Loan [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 3,528,615atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_CrossCreekMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		 3,448,615atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_CrossCreekMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember
Available for Sale Security and Property Loan Receivable, Carrying Value 3,528,615atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_CrossCreekMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		 3,448,615atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_CrossCreekMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember
Tyler Park Apartments [Member] | Available-for-sale Securities [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 8,100,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_TylerParkApartmentsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 8,100,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_TylerParkApartmentsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Available for Sale Security and Property Loan Receivable, Carrying Value 8,100,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_TylerParkApartmentsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 8,100,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_TylerParkApartmentsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Tyler Park Apartments [Member] | Property Loan [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_TylerParkApartmentsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_TylerParkApartmentsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember
Available for Sale Security and Property Loan Receivable, Carrying Value 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_TylerParkApartmentsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_TylerParkApartmentsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember
Santa Fe Apts [Member] | Available-for-sale Securities [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 4,736,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_SantaFeAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		  
Available for Sale Security and Property Loan Receivable, Carrying Value 4,736,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_SantaFeAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		  
Santa Fe Apts [Member] | Property Loan [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_SantaFeAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		  
Available for Sale Security and Property Loan Receivable, Carrying Value 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_SantaFeAptsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		  
Westside Village Market [Member] | Available-for-sale Securities [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 5,400,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_WestsideVillageMarketMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 5,400,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_WestsideVillageMarketMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Available for Sale Security and Property Loan Receivable, Carrying Value 5,400,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_WestsideVillageMarketMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 5,400,000atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_WestsideVillageMarketMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Westside Village Market [Member] | Property Loan [Member]    
Available for Sale Security and Property Loan Receivable, Maximum Exposure 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_WestsideVillageMarketMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableMaximumExposure
/ dei_EntityByLocationAxis
= atax_WestsideVillageMarketMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember
Available for Sale Security and Property Loan Receivable, Carrying Value $ 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_WestsideVillageMarketMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember		 $ 0atax_AvailableForSaleSecurityAndPropertyLoanReceivableCarryingValue
/ dei_EntityByLocationAxis
= atax_WestsideVillageMarketMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_LoansReceivableMember