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Summary of Accounting Policies (Details) - Disaggregation of Revenue - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 41,507	$ 49,509
Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenue	31,751	38,096
Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenue	10,914	12,235
Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	(1,158)	(822)
Revenue	(1,158)	(822)
POC Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	37,842	45,329
POC Revenue [Member] | Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenue	28,720	35,588
POC Revenue [Member] | Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenue	9,210	9,803
POC Revenue [Member] | Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	(88)	(62)
POT Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,665	4,180
POT Revenue [Member] | Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,031	2,508
POT Revenue [Member] | Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,704	2,432
POT Revenue [Member] | Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ (1,070)	$ (760)

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