0001185185-21-000886 | 10-K | XBRL Viewer | Frequency Electronics INC

Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Apr. 30, 2021	Jun. 25, 2021	Oct. 31, 2020
Document Information Line Items
Entity Registrant Name	FREQUENCY ELECTRONICS INC
Document Type	10-K
Current Fiscal Year End Date	--04-30
Entity Common Stock, Shares Outstanding		9,224,892
Entity Public Float			$ 58,700,000
Amendment Flag	false
Entity Central Index Key	0000039020
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Apr. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Interactive Data Current	Yes

Accrued Liabilities (Details) - Schedule of Accrued Liabilities - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020
Schedule of Accrued Liabilities [Abstract]
Incentive compensation	$ 550	$ 107

Income Taxes (Details) - Schedule of Effective Income Tax Rate Reconciliation - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Schedule of Effective Income Tax Rate Reconciliation [Abstract]
Other items	$ 12	$ 102

Label	Element	Value
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsTotalGrantsFromInceptionGross	feim_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsTotalGrantsFromInceptionGross	2,445,000
Prepaid income taxes	feim_DeferredAndPrepaidIncomeTaxes	$ 444,000
Prepaid income taxes	feim_DeferredAndPrepaidIncomeTaxes	849,000
Cash surrender value of life insurance	feim_CashSurrenderValueOfLifeInsuranceAndCashHeldInTrust	15,396,000
Cash surrender value of life insurance	feim_CashSurrenderValueOfLifeInsuranceAndCashHeldInTrust	14,790,000
AnticipatedLossOnContracts	feim_AnticipatedLossOnContracts	1,000,000
AnticipatedLossOnContracts	feim_AnticipatedLossOnContracts	$ 2,400,000
NumberOfPrincipalMarkets	feim_NumberOfPrincipalMarkets	3
DeferredTaxAssetsNetOfDeferredTaxLiabilities	feim_DeferredTaxAssetsNetOfDeferredTaxLiabilities	$ 16,855,000
DeferredTaxAssetsNetOfDeferredTaxLiabilities	feim_DeferredTaxAssetsNetOfDeferredTaxLiabilities	$ 15,846,000

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Cover Document And Entity Information Notes Details Accrued Liabilities (Details) - Schedule of Accrued Liabilities Income Taxes (Details) - Schedule of Effective Income Tax Rate Reconciliation Uncategorized Uncategorized Items - feim-20210430.xml All Reports