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Note 5 - Accrued Expenses (Details Textual) - USD ($) $ in Millions | Apr. 30, 2021 | Nov. 04, 2019
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Schrofftech [Member] |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | $ 2.4 | $ 2.4

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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=rfil_SchrofftechMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |