Document And Entity Information (USD $)
12 Months Ended
Apr. 30, 2013
Jul. 22, 2013
Oct. 31, 2012
Document and Entity Information [Abstract]      
Entity Registrant Name FREQUENCY ELECTRONICS INC    
Document Type 10-K    
Current Fiscal Year End Date --04-30    
Entity Common Stock, Shares Outstanding   8,493,333  
Entity Public Float     $ 45,300,000
Amendment Flag false    
Entity Central Index Key 0000039020    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Smaller Reporting Company    
Entity Well-known Seasoned Issuer No    
Document Period End Date Apr. 30, 2013    
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus FY