Segment Information (Details) - Schedule of Reconciliation of Assets from Segment to Consolidated - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020
Identifiable assets:
Identifiable Assets	$ 86,016	$ 91,276
Frequency Electronics Inc New York [Member]
Identifiable assets:
Identifiable Assets	34,869	44,599
Frequency Electronics Inc Zyfer [Member]
Identifiable assets:
Identifiable Assets	12,888	13,344
Inter Segment [Member]
Identifiable assets:
Identifiable Assets	0	(8,586)
Corporate Segment [Member]
Identifiable assets:
Identifiable Assets	$ 38,259	$ 41,919