Document And Entity Information - USD ($)	12 Months Ended
	Apr. 30, 2022	Jul. 08, 2022	Oct. 31, 2021
Document Information Line Items
Entity Registrant Name	FREQUENCY ELECTRONICS, INC.
Trading Symbol	FEIM
Document Type	10-K
Current Fiscal Year End Date	--04-30
Entity Common Stock, Shares Outstanding		9,296,800
Entity Public Float			$ 63,400,000
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, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	false
Document Annual Report	true
Document Transition Report	false
Entity File Number	1-8061
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	11-1986657
Entity Address, Address Line One	55 CHARLES LINDBERGH BLVD
Entity Address, City or Town	MITCHEL FIELD
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	11553
City Area Code	516-794-4500
Local Phone Number	516-794-4500
Title of 12(b) Security	Common Stock (par value $1.00 per share)
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes
Auditor Name	BDO USA, LLP
Auditor Location	Melville, New York
Auditor Firm ID	243