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SEGMENT INFORMATION (Details) - Disaggregation of Revenue - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 12,951	$ 12,554
Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenue	9,839	9,010
Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,922	3,701
Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	(810)	(157)
POC Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	11,651	11,509
POC Revenue [Member] | Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,622	8,160
POC Revenue [Member] | Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,038	3,323
POC Revenue [Member] | Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	(9)	26
POT Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,300	1,045
POT Revenue [Member] | Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,217	850
POT Revenue [Member] | Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenue	884	378
POT Revenue [Member] | Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ (801)	$ (183)

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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