Other Assets Loan Receivable and Allowance (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property loan receivable, outstanding balance	$ 22,191,515atax_PropertyLoanReceivableGross	$ 21,549,927atax_PropertyLoanReceivableGross
Accrued interest	8,324,812atax_LoanInterestReceivable	6,770,593atax_LoanInterestReceivable
Loan loss reserves	(7,098,814)	(7,023,814)
Interest Allowance	(7,427,074)atax_InterestAllowance	(6,194,477)atax_InterestAllowance
Net taxable loans	15,990,439us-gaap_LoansReceivableNet	15,102,229us-gaap_LoansReceivableNet
Arbors at Hickory Ridge [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property loan receivable, outstanding balance	191,264	191,264
Accrued interest	26,047	12,979
Loan loss reserves	0	0
Interest Allowance	0	0
Net taxable loans	217,311	204,243
Ashley Square [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property loan receivable, outstanding balance	5,078,342	5,078,342
Accrued interest	2,455,660	2,053,415
Loan loss reserves	(3,596,342)	(3,596,342)
Interest Allowance	(2,455,660)	(2,053,415)
Net taxable loans	1,482,000	1,482,000
Avistar Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property loan receivable, outstanding balance	274,496
Accrued interest	16,470
Loan loss reserves	0
Interest Allowance	0
Net taxable loans	290,966
Avistar Portolio-2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property loan receivable, outstanding balance	251,622
Accrued interest	15,097
Loan loss reserves	0
Interest Allowance	0
Net taxable loans	266,719
Cross Creek [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property loan receivable, outstanding balance	6,976,087	6,821,087
Accrued interest	2,084,804	1,825,389
Loan loss reserves	(3,447,472)	(3,372,472)
Interest Allowance	(2,084,804)	(1,825,389)
Net taxable loans	3,528,615	3,448,615
Greens of Pine Glen [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property loan receivable, outstanding balance	850,000	876,000
Accrued interest	231,342	130,563
Loan loss reserves	0	0
Interest Allowance	0	(921)
Net taxable loans	1,081,342	1,005,642
Foundation for Affordable Housing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property loan receivable, outstanding balance	1,560,553	1,603,083
Accrued interest	1,735	13,989
Loan loss reserves	0	0
Interest Allowance	0	0
Net taxable loans	1,562,288	1,617,072
Lake Forest [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property loan receivable, outstanding balance	4,618,704	4,618,704
Accrued interest	2,599,613	2,148,881
Loan loss reserves	(55,000)	(55,000)
Interest Allowance	(2,578,778)	(2,128,046)
Net taxable loans	4,584,539	4,584,539
Ohio Properties [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property loan receivable, outstanding balance	2,390,447	2,361,447
Accrued interest	894,044	585,377
Loan loss reserves	0	0
Interest Allowance	(307,832)	(186,706)
Net taxable loans	$ 2,976,659	$ 2,760,118

Interest receivable fully allowed for.

No definition available.

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- Definition

Carrying amount as of the balance sheet date of interest earned but not received from a loan.

+ References

No definition available.

+ Details

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- Definition

Property loan receivable, gross - Amount before allowance of loans held in portfolio. Includes principal only.

+ References

No definition available.

+ Details

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- Details

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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