Redeemable Series A Preferred Units Narrative Tagging (Details)	3 Months Ended
Jun. 30, 2017 shares
Series A Preferred Units
Redeemable preferred units, issued	0

Temporary equity stock issued during period shares new issues.

No definition available.

Name:	atax_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	atax_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration