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Other Assets Narrative Tagging (Details) (USD $)
 12 Months Ended 6 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2009
Jun. 30, 2013
Jun. 30, 2014
Mar. 31, 2013
Sep. 30, 2014
Sep. 30, 2013
Loans Receivable, Net $ 15,990,439us-gaap_LoansReceivableNet $ 15,102,229us-gaap_LoansReceivableNet              
Proceeds from Notes Payable 145,000us-gaap_ProceedsFromNotesPayable 0us-gaap_ProceedsFromNotesPayable 160,000us-gaap_ProceedsFromNotesPayable            
Property loan receivable, gross 22,191,515atax_PropertyLoanReceivableGross 21,549,927atax_PropertyLoanReceivableGross              
Allowance for Loan and Lease Losses, Write-offs 0us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs (914,116)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs 0us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs            
Available-for-sale Securities, at Par Value 409,506,066atax_AvailableForSaleSecuritiesAtParValue 299,841,918atax_AvailableForSaleSecuritiesAtParValue              
Provision for Loan and Lease Losses 75,000us-gaap_ProvisionForLoanAndLeaseLosses 168,000us-gaap_ProvisionForLoanAndLeaseLosses 0us-gaap_ProvisionForLoanAndLeaseLosses            
Contingent Interest Income 40,000atax_ContingentInterestIncome 6,497,160atax_ContingentInterestIncome 0atax_ContingentInterestIncome            
Mortgage Loans on Real Estate, Write-down or Reserve, Amt 0atax_MortgageLoansonRealEstateWritedownorReserveAmt (4,557,741)atax_MortgageLoansonRealEstateWritedownorReserveAmt 0atax_MortgageLoansonRealEstateWritedownorReserveAmt            
Avistar Portfolio 1 and 2 [Member]                  
Loans Receivable, Net           526,000us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_AvistarPortfolio1and2Member		      
The Palms at Premier Park [Member]                  
Asset Held For Sale Valuation   1,100,000atax_AssetHeldForSaleValuation
/ dei_EntityByLocationAxis
= atax_ThePalmsatPremierParkMember		              
Number of Units in Real Estate Property   240us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_EntityByLocationAxis
= atax_ThePalmsatPremierParkMember		              
Debt Instrument, Interest Rate, Stated Percentage 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_ThePalmsatPremierParkMember		 [1] 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_ThePalmsatPremierParkMember		              
Available-for-sale Security, Maturity Date at a point in time Jan. 01, 2050 [1] Jan. 01, 2050              
Available-for-sale Securities, at Par Value 20,152,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_ThePalmsatPremierParkMember		 [1] 20,152,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_ThePalmsatPremierParkMember		              
Ashley Square [Member]                  
Loans Receivable, Net 1,482,000us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_AshleySquareMember		 1,482,000us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_AshleySquareMember		              
Advances to Affiliate   184,000us-gaap_AdvancesToAffiliate
/ dei_EntityByLocationAxis
= atax_AshleySquareMember		              
Property loan receivable, gross 5,078,342atax_PropertyLoanReceivableGross
/ dei_EntityByLocationAxis
= atax_AshleySquareMember		 5,078,342atax_PropertyLoanReceivableGross
/ dei_EntityByLocationAxis
= atax_AshleySquareMember		              
Debt Instrument, Interest Rate, Stated Percentage 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_AshleySquareMember		 [2] 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_AshleySquareMember		 [2]              
Available-for-sale Security, Maturity Date at a point in time Dec. 01, 2025 [2] Dec. 01, 2025 [2]              
Available-for-sale Securities, at Par Value 5,159,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_AshleySquareMember		 [2] 5,212,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_AshleySquareMember		 [2]              
Cross Creek [Member]                  
Loans Receivable, Net 3,528,615us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_CrossCreekMember		 3,448,615us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_CrossCreekMember		              
Advances to Affiliate 155,000us-gaap_AdvancesToAffiliate
/ dei_EntityByLocationAxis
= atax_CrossCreekMember		 233,000us-gaap_AdvancesToAffiliate
/ dei_EntityByLocationAxis
= atax_CrossCreekMember		              
Property loan receivable, gross 6,976,087atax_PropertyLoanReceivableGross
/ dei_EntityByLocationAxis
= atax_CrossCreekMember		 6,821,087atax_PropertyLoanReceivableGross
/ dei_EntityByLocationAxis
= atax_CrossCreekMember		              
Debt Instrument, Interest Rate, Stated Percentage 6.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_CrossCreekMember		                
Available-for-sale Security, Maturity Date at a point in time Mar. 01, 2049                
Available-for-sale Securities, at Par Value 8,422,997atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_CrossCreekMember		                
Impairment of Intangible Assets (Excluding Goodwill) 75,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ dei_EntityByLocationAxis
= atax_CrossCreekMember		 168,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ dei_EntityByLocationAxis
= atax_CrossCreekMember		              
Foundation for Affordable Housing [Member]                  
Loans Receivable, Net 1,562,288us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_FoundationforAffordableHousingMember		 1,617,072us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_FoundationforAffordableHousingMember		              
Number of Units in Real Estate Property 96us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_EntityByLocationAxis
= atax_FoundationforAffordableHousingMember		 96us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_EntityByLocationAxis
= atax_FoundationforAffordableHousingMember		              
Proceeds from Notes Payable 43,000us-gaap_ProceedsFromNotesPayable
/ dei_EntityByLocationAxis
= atax_FoundationforAffordableHousingMember		                
Property loan receivable, gross 1,560,553atax_PropertyLoanReceivableGross
/ dei_EntityByLocationAxis
= atax_FoundationforAffordableHousingMember		 1,603,083atax_PropertyLoanReceivableGross
/ dei_EntityByLocationAxis
= atax_FoundationforAffordableHousingMember		              
Debt Instrument, Interest Rate, Stated Percentage   9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_FoundationforAffordableHousingMember		              
Greens of Pine Glen [Member]                  
Loans Receivable, Net 1,081,342us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_GreensOfPineGlenMember		 1,005,642us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_GreensOfPineGlenMember		              
Advances to Affiliate   26,000us-gaap_AdvancesToAffiliate
/ dei_EntityByLocationAxis
= atax_GreensOfPineGlenMember		              
Proceeds from Notes Payable 26,000us-gaap_ProceedsFromNotesPayable
/ dei_EntityByLocationAxis
= atax_GreensOfPineGlenMember		                
Property loan receivable, gross 850,000atax_PropertyLoanReceivableGross
/ dei_EntityByLocationAxis
= atax_GreensOfPineGlenMember		 876,000atax_PropertyLoanReceivableGross
/ dei_EntityByLocationAxis
= atax_GreensOfPineGlenMember		              
Available-for-sale Security, Maturity Date at a point in time     Oct. 01, 2047            
Ohio Properties [Member]                  
Loans Receivable, Net 2,976,659us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_OhioPropertiesMember		 2,760,118us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_OhioPropertiesMember		              
Advances to Affiliate 29,000us-gaap_AdvancesToAffiliate
/ dei_EntityByLocationAxis
= atax_OhioPropertiesMember		 42,000us-gaap_AdvancesToAffiliate
/ dei_EntityByLocationAxis
= atax_OhioPropertiesMember		              
Property loan receivable, gross 2,390,447atax_PropertyLoanReceivableGross
/ dei_EntityByLocationAxis
= atax_OhioPropertiesMember		 2,361,447atax_PropertyLoanReceivableGross
/ dei_EntityByLocationAxis
= atax_OhioPropertiesMember		              
Prairiebrook Village [Member]                  
Asset Held For Sale Valuation 375,000atax_AssetHeldForSaleValuation
/ dei_EntityByLocationAxis
= atax_PrairiebrookVillageMember		                
Provision for Loan and Lease Losses 711,000us-gaap_ProvisionForLoanAndLeaseLosses
/ dei_EntityByLocationAxis
= atax_PrairiebrookVillageMember		     700,000us-gaap_ProvisionForLoanAndLeaseLosses
/ dei_EntityByLocationAxis
= atax_PrairiebrookVillageMember		          
Vantage at Harlingen [Member]                  
Number of Units in Real Estate Property   288us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_EntityByLocationAxis
= atax_VantageatHarlingenMember		              
Debt Instrument, Interest Rate, Stated Percentage 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_VantageatHarlingenMember		 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_VantageatHarlingenMember		              
Available-for-sale Security, Maturity Date at a point in time Sep. 01, 2053 Oct. 01, 2053              
Available-for-sale Securities, at Par Value 6,692,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_VantageatHarlingenMember		 6,692,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_VantageatHarlingenMember		              
Woodland Park [Member]                  
Proceeds from Notes Payable 6,000,000us-gaap_ProceedsFromNotesPayable
/ dei_EntityByLocationAxis
= atax_WoodlandParkMember		                
Debt Instrument, Interest Rate, Stated Percentage                 2.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_WoodlandParkMember
Allowance for Loan and Lease Losses, Write-offs         1,300,000us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ dei_EntityByLocationAxis
= atax_WoodlandParkMember		        
Avistar Portolio-2 [Member]                  
Loans Receivable, Net 266,719us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_AvistarPortolio2Member		                
Property loan receivable, gross 251,622atax_PropertyLoanReceivableGross
/ dei_EntityByLocationAxis
= atax_AvistarPortolio2Member		                
Avistar Portfolio [Member]                  
Loans Receivable, Net 290,966us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_AvistarPortfolioMember		                
Property loan receivable, gross 274,496atax_PropertyLoanReceivableGross
/ dei_EntityByLocationAxis
= atax_AvistarPortfolioMember		                
Debt Instrument, Interest Rate, Stated Percentage           12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_AvistarPortfolioMember		      
Debt Instrument, Maturity Date           Jun. 26, 2024      
Iona Lakes [Member]                  
Proceeds from Sale of Available-for-sale Securities   21,900,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_IonaLakesMember		       21,900,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_EntityByLocationAxis
= atax_IonaLakesMember		      
Contingent Interest Income   6,500,000atax_ContingentInterestIncome
/ dei_EntityByLocationAxis
= atax_IonaLakesMember		       6,500,000atax_ContingentInterestIncome
/ dei_EntityByLocationAxis
= atax_IonaLakesMember		      
Mortgage Loans on Real Estate, Write-down or Reserve, Amt   4,600,000atax_MortgageLoansonRealEstateWritedownorReserveAmt
/ dei_EntityByLocationAxis
= atax_IonaLakesMember		       4,600,000atax_MortgageLoansonRealEstateWritedownorReserveAmt
/ dei_EntityByLocationAxis
= atax_IonaLakesMember		      
Vantage at Judson [Member]                  
Number of Units in Real Estate Property     288us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_EntityByLocationAxis
= atax_VantageAtJudsonMember		            
Debt Instrument, Interest Rate, Stated Percentage 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_VantageAtJudsonMember		 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_VantageAtJudsonMember		 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_VantageAtJudsonMember		            
Available-for-sale Security, Maturity Date at a point in time Feb. 01, 2053 Feb. 01, 2053 Feb. 01, 2053            
Available-for-sale Securities, at Par Value 6,049,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_VantageAtJudsonMember		 6,049,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_VantageAtJudsonMember		              
Arbors at Hickory Ridge [Member]                  
Loans Receivable, Net 217,311us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_ArborsAtHickoryRidgeMember		 204,243us-gaap_LoansReceivableNet
/ dei_EntityByLocationAxis
= atax_ArborsAtHickoryRidgeMember		              
Property loan receivable, gross 191,264atax_PropertyLoanReceivableGross
/ dei_EntityByLocationAxis
= atax_ArborsAtHickoryRidgeMember		 191,264atax_PropertyLoanReceivableGross
/ 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		 [3]              
Available-for-sale Security, Maturity Date at a point in time Dec. 01, 2049 [1] Dec. 01, 2049 [3]              
Available-for-sale Securities, at Par Value 11,450,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_ArborsAtHickoryRidgeMember		 [1] 11,450,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_ArborsAtHickoryRidgeMember		 [3]              
Series D [Member] | Vantage at Harlingen [Member]                  
Debt Instrument, Interest Rate, Stated Percentage   9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_VantageatHarlingenMember
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesDMember		              
Available-for-sale Security, Maturity Date at a point in time   Oct. 01, 2053              
Available-for-sale Securities, at Par Value   1,283,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_VantageatHarlingenMember
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesDMember		              
Series D [Member] | Vantage at Judson [Member]                  
Available-for-sale Securities, at Par Value     934,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_VantageAtJudsonMember
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesDMember		            
Series C [Member] | Vantage at Harlingen [Member]                  
Debt Instrument, Interest Rate, Stated Percentage   9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_VantageatHarlingenMember
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesCMember		              
Available-for-sale Securities, at Par Value   6,700,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_VantageatHarlingenMember
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesCMember		              
Series C [Member] | Avistar Portolio-2 [Member]                  
Debt Instrument, Interest Rate, Stated Percentage   9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_AvistarPortolio2Member
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesCMember		       9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_AvistarPortolio2Member
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesCMember		      
Available-for-sale Security, Maturity Date at a point in time   Sep. 01, 2050       Sep. 01, 2050      
Available-for-sale Securities, at Par Value   831,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_AvistarPortolio2Member
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesCMember		       831,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_AvistarPortolio2Member
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesCMember		      
Series C [Member] | Avistar Portfolio [Member]                  
Debt Instrument, Interest Rate, Stated Percentage   9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_AvistarPortfolioMember
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesCMember		         9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_AvistarPortfolioMember
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesCMember		 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_AvistarPortfolioMember
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesCMember		  
Available-for-sale Security, Maturity Date at a point in time   Apr. 01, 2050         Apr. 01, 2050 Apr. 01, 2050  
Available-for-sale Securities, at Par Value   804,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_AvistarPortfolioMember
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesCMember		         804,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_AvistarPortfolioMember
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesCMember		 804,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_AvistarPortfolioMember
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesCMember		  
Series C [Member] | Vantage at Judson [Member]                  
Available-for-sale Securities, at Par Value 6,000,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_VantageAtJudsonMember
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesCMember		   6,000,000atax_AvailableForSaleSecuritiesAtParValue
/ dei_EntityByLocationAxis
= atax_VantageAtJudsonMember
/ invest_InvestmentSecuritiesSeriesAxis
= atax_SeriesCMember		            
Minimum [Member]                  
Discount Rate for Impairment Analysis 5.75%atax_DiscountRateForImpairmentAnalysis
/ us-gaap_VariableRateAxis
= us-gaap_MinimumMember		                
Maximum [Member]                  
Discount Rate for Impairment Analysis 7.00%atax_DiscountRateForImpairmentAnalysis
/ us-gaap_VariableRateAxis
= us-gaap_MaximumMember		                
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] | Prairiebrook Village [Member]                  
Land $ 400,000us-gaap_Land
/ dei_EntityByLocationAxis
= atax_PrairiebrookVillageMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AvailableforsaleSecuritiesMember		                
[1] (3) Bonds owned by ATAX TEBS II, LLC, Note 11
[2] Bonds owned by ATAX TEBS I, LLC, Note 11
[3] Bond held by Deutsche Bank in a secured financing transaction, Note 11