Other Assets (Additional Information) (Details) $ in Millions	Sep. 30, 2022 USD ($)
Other Assets [Abstract]
Taxable mortgage revenue bonds with fair value, held in trust	$ 9.0

Taxable mortgage revenue bonds with fair value, held in trust.

No definition available.

Name:	atax_TaxableMortgageRevenueBondsWithFairValueHeldInTrust
Namespace Prefix:	atax_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant