Commitments and Contingencies - Additional Information (Details)	Mar. 31, 2020
Greens of Pine Glen [Member]
Commitments And Other Guarantees [Line Items]
Percentage of loss contingency, range of possible loss, maximum	75.00%

The estimated maximum percentage of possible loss from the contingency.

No definition available.

Name:	atax_PercentageOfLossContingencyRangeOfPossibleLossMaximum
Namespace Prefix:	atax_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant