Carrying value inclusive of accrued interest

No definition available.

Name:	atax_CarryingValueInclusiveOfAccruedInterest
Namespace Prefix:	atax_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt instrument maturity period.

+ References

No definition available.

+ Details

Name:	atax_DebtInstrumentMaturityPeriod
Namespace Prefix:	atax_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Gain (loss) on sale before settlement of final proceed sand expenses.

+ References

No definition available.

+ Details

Name:	atax_GainLossOnSaleBeforeSettlementOfFinalProceedSandExpenses
Namespace Prefix:	atax_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Increase (decrease) in threshold percentage modified interest rate.

+ References

No definition available.

+ Details

Name:	atax_IncreaseDecreaseInThresholdPercentageModifiedInterestRate
Namespace Prefix:	atax_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of outstanding senior mortgage revenue bonds.

+ References

No definition available.

+ Details

Name:	atax_PercentageOfOutstandingSeniorMortgageRevenueBonds
Namespace Prefix:	atax_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

This is the principal amount outstanding for securitized loans only (across all types of loans).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

+ Details

Name:	us-gaap_PrincipalAmountOutstandingOnLoansSecuritized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from the capital received in cash from a partner in a partnership during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

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

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=atax_BarclaysCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=atax_TrustTwentyTwentyOneXfTwoThousandNineHundredAndFiftyThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_LineOfCreditFacilityAxis=atax_MizuhoCapitalMarketsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Subsequent Events - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 31, 2022	Sep. 30, 2022	Jun. 30, 2022
TOB [Member] \| Barclays [Member] \| Trust 2021-XF2953 [Member]
Subsequent Event [Line Items]
Stated Maturities			2023-04
TOB [Member] \| Mizuho Capital Markets [Member]
Subsequent Event [Line Items]
Stated Maturities			2023-07
Scenario Forecast [Member]
Subsequent Event [Line Items]
Gain on sale settlement of final proceeds and expenses.		$ 10.6
Subsequent Event [Member]
Subsequent Event [Line Items]
Net cash received inclusive of return of contributed equity	$ 19.4
Increased the threshold percentage, modified the interest rate	2.50%
Percentage of outstanding senior MRBs	9.20%
Carrying value, inclusive of accrued interest	$ 4.6
Subsequent Event [Member] \| TOB [Member] \| Barclays [Member] \| Trust 2021-XF2953 [Member]
Subsequent Event [Line Items]
Stated Maturities	2023-07
Subsequent Event [Member] \| TOB [Member] \| Mizuho Capital Markets [Member]
Subsequent Event [Line Items]
Stated Maturities	2025-07
Outstanding principal	$ 59.7