SEGMENT INFORMATION (Details) - Reconciliation of Revenue from Segments to Consolidated - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 12,936	$ 13,990	$ 25,890	$ 26,940
Frequency Electronics Inc New York [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	10,381	11,156	20,543	20,996
Frequency Electronics Inc Zyfer [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	2,648	3,430	5,783	7,353
Inter Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (93)	$ (596)	$ (436)	$ (1,409)