NOTE G - SEGMENT INFORMATION (Details)	6 Months Ended
Oct. 31, 2017
NOTE G - SEGMENT INFORMATION (Details) [Line Items]
Number of Reportable Segments	2
Frequency Electronics Inc New York [Member]
NOTE G - SEGMENT INFORMATION (Details) [Line Items]
Number Of Principal Markets	3

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration