Note 15 - Fair Value of Financial Measurements and Disclosures (Details Textual)	Dec. 31, 2019
Measurement Input, Discount Rate [Member]
Consumer Receivables Acquired for Liquidation, Measurement Input	0.2

Value of input used to measure consumer receivables acquired for liquidation.

No definition available.

Name:	asfi_ConsumerReceivablesAcquiredForLiquidationMeasurementInput
Namespace Prefix:	asfi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant