v3.26.1
Document And Entity Information - USD ($)
 12 Months Ended
Apr. 30, 2026
Jul. 15, 2026
Oct. 31, 2025
Document Information Line Items      
Entity Central Index Key 0000039020    
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --04-30    
Document Period End Date Apr. 30, 2026    
Document Fiscal Year Focus 2026    
Document Transition Report false    
Entity File Number 1-8061    
Entity Registrant Name FREQUENCY ELECTRONICS, INC.    
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    
Local Phone Number 794-4500    
Title of 12(b) Security Common Stock (par value $1.00 per share)    
Trading Symbol FEIM    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 240,400,000
Entity Common Stock, Shares Outstanding   9,870,077  
Documents Incorporated by Reference [Text Block]

DOCUMENTS INCORPORATED BY REFERENCE: PART III incorporates information by reference from the definitive proxy statement to be filed with the Securities and Exchange Commission with respect to the Annual Meeting of Stockholders to be held on or about October 7, 2026.

    
Auditor Name GRANT THORNTON LLP    
Auditor Location Melville, NY    
Auditor Firm ID 248    
Amendment Flag false    
Document Fiscal Period Focus FY