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Partnership Income, Expense and Cash Distributions Distributions (Details)
Dec. 31, 2014
Percent of Regular Distributions 100.00%atax_PercentOfRegularDistributions
Penalty on Outstanding Contingent Interest 0.90%atax_PenaltyOnOutstandingContingentInterest
Limited Partner [Member]  
Percent of Regular Distributions 99.00%atax_PercentOfRegularDistributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
Special Distribution 75.00%atax_SpecialDistribution
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
General Partner [Member]  
Percent of Regular Distributions 1.00%atax_PercentOfRegularDistributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
Special Distribution 25.00%atax_SpecialDistribution
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember