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SEGMENT INFORMATION (Details) - Reconciliation of Revenue from Segments to Consolidated - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Revenues:    
Revenues $ 12,951 $ 12,554
Frequency Electronics Inc New York [Member]    
Revenues:    
Revenues 9,839 9,010
Frequency Electronics Inc Zyfer [Member]    
Revenues:    
Revenues 3,922 3,701
Inter Segment [Member]    
Revenues:    
Revenues $ (810) $ (157)