Summary of Accounting Policies (Details) - Disaggregation of Revenue - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 48,296	$ 54,254
Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenue	41,157	42,400
Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenue	7,827	13,835
Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	(688)	(1,981)
POC Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	46,387	50,208
POC Revenue [Member] | Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenue	39,618	39,225
POC Revenue [Member] | Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,770	10,993
POC Revenue [Member] | Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	(1)	(10)
POT Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,909	4,046
POT Revenue [Member] | Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,539	3,175
POT Revenue [Member] | Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,057	2,842
POT Revenue [Member] | Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ (687)	$ (1,971)