SEGMENT INFORMATION (Details) - Disaggregation of Revenue - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 11,672	$ 9,628	$ 38,612	$ 31,270
Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenue	9,411	7,234	30,406	24,029
Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,481	2,787	9,833	8,487
Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	(220)	(393)	(1,627)	(1,246)
POC Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	10,815	8,542	35,556	28,482
POC Revenue [Member] | Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,990	6,124	27,997	21,215
POC Revenue [Member] | Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,825	2,423	7,569	7,348
POC Revenue [Member] | Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue		(5)	(10)	(81)
POT Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	857	1,086	3,056	2,788
POT Revenue [Member] | Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenue	421	1,110	2,409	2,814
POT Revenue [Member] | Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenue	656	364	2,264	1,139
POT Revenue [Member] | Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ (220)	$ (388)	$ (1,617)	$ (1,165)