Construction Comepletion Date

No definition available.

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- Definition

Estimated debt of construction after the project is completed.

+ References

No definition available.

+ Details

Name:	atax_EstimatedDebtOfConstruction
Namespace Prefix:	atax_
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Balance Type:	credit
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- Definition

Estimated Total Cost of Construction

+ References

No definition available.

+ Details

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Namespace Prefix:	atax_
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- Definition

Number of Limited Liability Companies

+ References

No definition available.

+ Details

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Namespace Prefix:	atax_
Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

Number of Parking Stalls

+ References

No definition available.

+ Details

Name:	atax_NumberOfParkingStalls
Namespace Prefix:	atax_
Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

Third Party Contribution to Building

+ References

No definition available.

+ Details

Name:	atax_ThirdPartyContributionToBuilding
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
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Balance Type:	na
Period Type:	instant

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of units in a real estate property owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

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Real Estate Assets RE MF Properties (Details) (USD $)							3 Months Ended
Real Estate Assets RE MF Properties (Details) (USD $)	Jun. 30, 2012	Mar. 31, 2013 Limited Liability Company [Member] properties	Mar. 31, 2013 General Partner [Member]	Mar. 31, 2013 Consolidated Properties [Member] properties	Mar. 31, 2013 Consolidated Properties [Member] Limited Partner [Member] properties	Sep. 30, 2012 Maples on 97th [Member] Unit	Mar. 31, 2013 Construction in Progress [Member] Unit parkingstalls
Other Ownership Interests [Line Items]
Operating Leases, Rent Expense							$ 100
Number of Parking Stalls							1,605
Number of Real Estate Properties				7	3
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	25.00%		1.00%
Noncontrolling Interest, Ownership Percentage by Parent		100.00%			99.00%
Number of Limited Liability Companies		4
Number of Units in Real Estate Property						258	475
Business Acquisition, Cost of Acquired Entity, Purchase Price						5,500,000
Third Party Contribution to Building							16,700,000
Estimated Total Cost of Construction							34,000,000
Construction Comepletion Date							Aug. 01, 2014
Estimated Debt of Construction							$ 29,800,000