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Mortgages Payable Footnote Tagging (Details) (USD $)
 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Sep. 30, 2012
Mar. 31, 2013
Jun. 30, 2013
Mortgages payable $ 76,707,834us-gaap_LongTermDebt $ 57,087,320us-gaap_LongTermDebt              
Repayments of Long-term Debt 98,730,000us-gaap_RepaymentsOfLongTermDebt 2,164,000us-gaap_RepaymentsOfLongTermDebt 8,835,000us-gaap_RepaymentsOfLongTermDebt            
Proceeds from Notes Payable 145,000us-gaap_ProceedsFromNotesPayable 0us-gaap_ProceedsFromNotesPayable 160,000us-gaap_ProceedsFromNotesPayable            
Eagle Village [Member]                  
Repayments of Long-term Debt       400,000us-gaap_RepaymentsOfLongTermDebt
/ dei_EntityByLocationAxis
= atax_EagleVillageMember		          
Glynn Place [Member]                  
Repayments of Long-term Debt       1,900,000us-gaap_RepaymentsOfLongTermDebt
/ dei_EntityByLocationAxis
= atax_GlynnPlaceMember		          
Arboretum [Member]                  
Long-term Debt, Refinanced, Date         Mar. 28, 2017        
Debt Instrument, Interest Rate, Stated Percentage         3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_ArboretumMember		        
Woodland Park [Member]                  
Notes Payable, Current           7,000,000us-gaap_NotesPayableCurrent
/ dei_EntityByLocationAxis
= atax_WoodlandParkMember		      
Debt Instrument, Interest Rate, Stated Percentage           2.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_WoodlandParkMember		      
Long Term Debt, Maturity date at a point in time             Aug. 01, 2017    
Debt Instrument, Basis Spread on Variable Rate           0.20%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dei_EntityByLocationAxis
= atax_WoodlandParkMember		      
Debt, Weighted Average Interest Rate           3.00%us-gaap_DebtWeightedAverageInterestRate
/ dei_EntityByLocationAxis
= atax_WoodlandParkMember		      
Proceeds from Notes Payable 6,000,000us-gaap_ProceedsFromNotesPayable
/ dei_EntityByLocationAxis
= atax_WoodlandParkMember		                
Maples on 97th [Member]                  
Mortgages payable               7,500,000us-gaap_LongTermDebt
/ dei_EntityByLocationAxis
= atax_MaplesOn97ThMember		  
Debt Instrument, Interest Rate, Stated Percentage               3.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_EntityByLocationAxis
= atax_MaplesOn97ThMember		  
Long Term Debt, Maturity date at a point in time               Feb. 10, 2016  
Conventional Mortgage Loan [Member] | The 50/50 Student Housing--UNL [Member]                  
Mortgages payable 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]                  
Mortgages payable $ 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