NOTE F - SEGMENT INFORMATION (Details) - Schedule of Reconciliation of Assets from Segment to Consolidated - USD ($) $ in Thousands	Jan. 31, 2016	Apr. 30, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	$ 119,848	$ 117,825
Frequency Electronics Inc New York [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	61,452	63,541
Gillam Frequency Electronics Inc [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	9,774	9,878
Frequency Electronics Inc Zyfer [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	11,703	11,088
Inter Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	(6,120)	(8,775)
Corporate Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	$ 43,039	$ 42,093