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Segment Information (Details) - Reconciliation of Operating Profit (Loss) from Segments to Consolidated - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2020 | Apr. 30, 2019
Operating loss: |  |
Operating profit (loss) | $ (10,922) | $ (2,817)
Frequency Electronics Inc New York [Member] |  |
Operating loss: |  |
Operating profit (loss) | (9,910) | (4,429)
Frequency Electronics Inc Zyfer [Member] |  |
Operating loss: |  |
Operating profit (loss) | (673) | 1,730
Corporate Segment [Member] |  |
Operating loss: |  |
Operating profit (loss) | $ (339) | $ (118)

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