Represents covenant for fixed charge ratio.

No definition available.

Name:	rfil_DebtInstrumentCovenantFixedChargeCoverageRatio
Namespace Prefix:	rfil_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents covenant for EBITDA requirement.

+ References

No definition available.

+ Details

Name:	rfil_DebtInstrumentCovenantMaximumEbitdaRatio
Namespace Prefix:	rfil_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represent the required EBITDA by a covenant.

+ References

No definition available.

+ Details

Name:	rfil_DentInstrumentCovenantRequiredEbitda
Namespace Prefix:	rfil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=rfil_BankOfAmericaNaMember
Namespace Prefix:
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Period Type:

Note 13 - Term loan, Line of credit and PPP loans (Details Textual)			1 Months Ended		6 Months Ended
	Apr. 30, 2022 USD ($)	May 01, 2020 USD ($)	Feb. 28, 2022 USD ($)	May 31, 2020 USD ($)	Apr. 30, 2022 USD ($)	Apr. 30, 2021 USD ($)	Feb. 25, 2022 USD ($)	Jan. 31, 2022 USD ($)
Paycheck Protection Program CARES Act [Member]
Proceeds from Issuance of Long-term Debt, Total		$ 2,800,000		$ 2,800,000
Term Loan [Member]
Debt Instrument, Interest Rate, Stated Percentage			3.76%
Long-Term Debt, Gross	$ 16,798,000				$ 16,798,000
Proceeds from Issuance of Long-term Debt, Total					17,000,000	$ 0
Revolving Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate			2.00%
Long-term Line of Credit, Total	$ 0				$ 0
Bank of America, N.A. [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 3,000,000.0
Debt Instrument, Face Amount			$ 17,000,000.0				$ 17,000,000
Debt Instrument, Covenant, Maximum EBITDA Ratio	3.00
Debt Instrument, Covenant, Fixed Charge Coverage Ratio	1.25
Dent Instrument, Covenant Required Ebitda								$ 600,000