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Segment Information (Details) - Schedule of Reconciliation of Depreciation and Amortization from Segment to Consolidated - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2020 | Apr. 30, 2019
Depreciation and amortization (allocated): |  |
Depreciation and Amortization | $ 3,319 | $ 2,802
Frequency Electronics Inc New York [Member] |  |
Depreciation and amortization (allocated): |  |
Depreciation and Amortization | 3,192 | 2,695
Frequency Electronics Inc Zyfer [Member] |  |
Depreciation and amortization (allocated): |  |
Depreciation and Amortization | 112 | 92
Corporate Segment [Member] |  |
Depreciation and amortization (allocated): |  |
Depreciation and Amortization | $ 15 | $ 15

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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