SEGMENT INFORMATION (Details) - Reconciliation of Revenue from Segments to Consolidated - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Revenues:
Revenues	$ 11,672	$ 9,628	$ 38,612	$ 31,270
Frequency Electronics Inc New York [Member]
Revenues:
Revenues	9,411	7,234	30,406	24,029
Frequency Electronics Inc Zyfer [Member]
Revenues:
Revenues	2,481	2,787	9,833	8,487
Inter Segment [Member]
Revenues:
Revenues	$ (220)	$ (393)	$ (1,627)	$ (1,246)