Segment Information (Details) - Reconciliation of Operating Profit (Loss) from Segments to Consolidated - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Operating (loss) income:
Operating profit (loss)	$ (8,038)	$ (958)
Frequency Electronics Inc New York [Member]
Operating (loss) income:
Operating profit (loss)	(5,679)	(1,067)
Frequency Electronics Inc Zyfer [Member]
Operating (loss) income:
Operating profit (loss)	(2,104)	655
Inter Segment [Member]
Operating (loss) income:
Operating profit (loss)	79	(204)
Corporate Segment [Member]
Operating (loss) income:
Operating profit (loss)	$ (334)	$ (342)