NOTE G - SEGMENT INFORMATION (Details) - Reconciliation of Revenue 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
Revenues:
Revenues	$ 9,337	$ 11,466	$ 21,360	$ 23,028
Frequency Electronics Inc New York [Member]
Revenues:
Revenues	6,579	7,733	15,740	17,715
Frequency Electronics Inc Zyfer [Member]
Revenues:
Revenues	3,593	4,249	7,865	6,596
Inter Segment [Member]
Revenues:
Revenues	$ (835)	$ (516)	$ (2,245)	$ (1,283)

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration