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SEGMENT INFORMATION (Details) - Reconciliation of Operating Profit (Loss) from Segments to Consolidated - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Consolidated operating income (loss) | $ 303 | $ 219 | $ (1,385) | $ (119)
Frequency Electronics Inc New York [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Consolidated operating income (loss) | (64) | 41 | (1,075) | (582)
Frequency Electronics Inc Zyfer [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Consolidated operating income (loss) | (132) | 306 | (99) | 667
Inter Segment [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Consolidated operating income (loss) | 0 |  | (20) |
Corporate Segment [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Consolidated operating income (loss) | $ 499 | $ (128) | $ (191) | $ (204)

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