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, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Operating loss:
Operating profit (loss)	$ (1,866)	$ (1,182)	$ (1,686)	$ (1,590)
Frequency Electronics Inc New York [Member]
Operating loss:
Operating profit (loss)	(2,358)	(1,714)	(2,758)	(1,887)
Frequency Electronics Inc Zyfer [Member]
Operating loss:
Operating profit (loss)	584	648	1,275	463
Corporate Segment [Member]
Operating loss:
Operating profit (loss)	$ (92)	$ (116)	$ (203)	$ (166)