SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)	Oct. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)
SEGMENT INFORMATION (Details) [Line Items]
Number of Reportable Segments			2
Revenues	$ 12,936	$ 13,990	$ 25,890	$ 26,940
Frequency Electronics Inc New York [Member]
SEGMENT INFORMATION (Details) [Line Items]
Number Of Principal Markets	3		3
Revenues	$ 10,381	11,156	$ 20,543	20,996
POC Revenue [Member]
SEGMENT INFORMATION (Details) [Line Items]
Revenues	12,228	12,940	24,629	24,591
POC Revenue [Member] | Frequency Electronics Inc New York [Member]
SEGMENT INFORMATION (Details) [Line Items]
Revenues	9,928	10,235	19,529	18,857
POT Revenue [Member]
SEGMENT INFORMATION (Details) [Line Items]
Revenues	708	1,050	1,261	2,349
POT Revenue [Member] | Frequency Electronics Inc New York [Member]
SEGMENT INFORMATION (Details) [Line Items]
Revenues	$ 453	$ 921	$ 1,014	$ 2,139