Note 15 - Subsequent Events (Details Textual) $ in Millions	1 Months Ended
Feb. 28, 2021 USD ($)
Paycheck Protection Program CARES Act [Member] \| Subsequent Event [Member]
Debt Instrument, Forgiveness Amount	$ 2.8

The amount of indebtedness forgiven by the holder of the debt instrument.

No definition available.

Name:	rfil_DebtInstrumentForgivenessAmount
Namespace Prefix:	rfil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration