Note 15 - Subsequent Events (Details Textual) - USD ($) $ in Millions		1 Months Ended
May 05, 2020	May 31, 2020
Subsequent Event [Member]
Proceeds from Paycheck Protection Program Under CARES Act	$ 2.8	$ 2.8

The cash inflow received from loan funding under the Paycheck Protection Program which was established under the Coronavirus Aid, Relief and Economic Security (CARES) Act in March 2020.

No definition available.

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