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Public Housing Capital Fund Trusts Mark to Market PHC (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value $ 60,272,941atax_AvailableForSaleSecuritiesFairValueDisclosurePublicHousingAuthority $ 61,263,123atax_AvailableForSaleSecuritiesFairValueDisclosurePublicHousingAuthority
Public housing capital fund trusts [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for amortization of premium and discounts 59,874,268atax_AvailableForSaleSecuritiesAmortizedCostBasisPublicHousingAuthority
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
59,887,921atax_AvailableForSaleSecuritiesAmortizedCostBasisPublicHousingAuthority
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Unrealized Gain 484,160atax_AvailableForSaleSecuritiesUnrealizedGainPublicHousingAuthority
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
1,375,202atax_AvailableForSaleSecuritiesUnrealizedGainPublicHousingAuthority
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Unrealized Loss (85,487)atax_AvailableForSaleSecuritiesGrossUnrealizedLossesPublicHousingAuthority
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
0atax_AvailableForSaleSecuritiesGrossUnrealizedLossesPublicHousingAuthority
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Estimated Fair Value 60,272,941atax_AvailableForSaleSecuritiesFairValueDisclosurePublicHousingAuthority
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
61,263,123atax_AvailableForSaleSecuritiesFairValueDisclosurePublicHousingAuthority
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Public Housing Capital Fund Trust I [Member] | Public housing capital fund trusts [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for amortization of premium and discounts 27,379,187atax_AvailableForSaleSecuritiesAmortizedCostBasisPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
27,414,100atax_AvailableForSaleSecuritiesAmortizedCostBasisPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Unrealized Gain 484,160atax_AvailableForSaleSecuritiesUnrealizedGainPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
933,789atax_AvailableForSaleSecuritiesUnrealizedGainPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Unrealized Loss 0atax_AvailableForSaleSecuritiesGrossUnrealizedLossesPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
0atax_AvailableForSaleSecuritiesGrossUnrealizedLossesPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Estimated Fair Value 27,863,347atax_AvailableForSaleSecuritiesFairValueDisclosurePublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
28,347,889atax_AvailableForSaleSecuritiesFairValueDisclosurePublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Public Housing Capital Fund Trust II [Member] | Public housing capital fund trusts [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for amortization of premium and discounts 12,011,169atax_AvailableForSaleSecuritiesAmortizedCostBasisPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
11,999,721atax_AvailableForSaleSecuritiesAmortizedCostBasisPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Unrealized Gain 0atax_AvailableForSaleSecuritiesUnrealizedGainPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
152,293atax_AvailableForSaleSecuritiesUnrealizedGainPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Unrealized Loss (40,868)atax_AvailableForSaleSecuritiesGrossUnrealizedLossesPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
0atax_AvailableForSaleSecuritiesGrossUnrealizedLossesPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Estimated Fair Value 11,970,301atax_AvailableForSaleSecuritiesFairValueDisclosurePublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
12,152,014atax_AvailableForSaleSecuritiesFairValueDisclosurePublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Public Housing Capital Fund Trust III [Member] | Public housing capital fund trusts [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for amortization of premium and discounts 20,483,912atax_AvailableForSaleSecuritiesAmortizedCostBasisPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
20,474,100atax_AvailableForSaleSecuritiesAmortizedCostBasisPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Unrealized Gain 0atax_AvailableForSaleSecuritiesUnrealizedGainPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
289,120atax_AvailableForSaleSecuritiesUnrealizedGainPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Unrealized Loss (44,619)atax_AvailableForSaleSecuritiesGrossUnrealizedLossesPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
0atax_AvailableForSaleSecuritiesGrossUnrealizedLossesPublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
Estimated Fair Value $ 20,439,293atax_AvailableForSaleSecuritiesFairValueDisclosurePublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember
$ 20,763,220atax_AvailableForSaleSecuritiesFairValueDisclosurePublicHousingAuthority
/ atax_EntityByTrustAxis
= atax_PublicHousingCapitalFundTrustIiiMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioPhcftMember