NOTE G - SEGMENT INFORMATION (Details) - Reconciliation of Operating Profit (Loss) from Segments to Consolidated - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Operating loss:
Operating profit (loss)	$ (230)	$ (1,866)	$ (146)	$ (1,686)
Frequency Electronics Inc New York [Member]
Operating loss:
Operating profit (loss)	(185)	(2,358)	(402)	(2,758)
Frequency Electronics Inc Zyfer [Member]
Operating loss:
Operating profit (loss)	72	584	458	1,275
Corporate Segment [Member]
Operating loss:
Operating profit (loss)	$ (117)	$ (92)	$ (202)	$ (203)