v2.4.0.6
Document and Entity Information (USD $)
12 Months Ended
Apr. 30, 2012
Jul. 23, 2012
Oct. 31, 2011
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Apr. 30, 2012    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY    
Trading Symbol FEIM    
Entity Registrant Name FREQUENCY ELECTRONICS INC    
Entity Central Index Key 0000039020    
Current Fiscal Year End Date --04-30    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Smaller Reporting Company    
Entity Common Stock, Shares Outstanding   8,383,734  
Entity Public Float     $ 46,700,000