15. Segment Information (Details) - Reconciliation of Assets from Segment to Consolidate (Parentheticals) (Frequency Electronics Inc New York China [Member], USD $) In Millions, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Frequency Electronics Inc New York China [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable assets in China (in Dollars)	$ 3	$ 3