SEGMENT INFORMATION (Details) - Reconciliation of Revenue from Segments to Consolidated - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 12,245	$ 11,672	$ 38,136	$ 38,612
Frequency Electronics Inc New York [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	10,855	9,411	31,399	30,406
Frequency Electronics Inc Zyfer [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,558	2,481	7,341	9,833
Inter Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (168)	$ (220)	$ (604)	$ (1,627)