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Investments in Affiliates (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 28, 2023 | Jan. 29, 2022 | Jan. 28, 2023 | Jan. 29, 2022 | Apr. 30, 2022
Schedule of Investments [Line Items] |  |  |  |  |
Equity method investments | $ 17,145 |  | $ 17,145 |  | $ 16,916
Equity in loss of affiliate | 895 | $ 401 | 2,596 | $ 1,966 |
Accounts payable | 52 |  | 52 |  |
Amount invested |  |  | 3,240 | $ 6,695 |
Debt conversion, converted instrument, amount |  |  | 2,823 |  |
Purchase of convertible notes | $ 7,693 |  | $ 7,693 |  |
Miortech |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Ownership percentage | 54.50% |  | 54.50% |  |
XdisplayTM |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Ownership percentage | 16.40% |  | 16.40% |  |
Convertible Debt |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Amount invested |  |  | $ 2,250 |  |
Promissory Notes |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Amount invested |  |  | $ 990 |  |
Product Design and Development |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Related party transaction, amounts of transaction | $ 672 | $ 1,520 |  |  |

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