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INVESTMENT IN MORION, INC. (Details) - Morion Inc [Member] - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020
INVESTMENT IN MORION, INC. (Details) [Line Items] |  |  |  |
Cost Method Investment Ownership Percentage | 4.60% |  | 4.60% |
Investment Owned, at Cost | $ 800,000 |  | $ 800,000 |
Related Party Transaction, Purchases from Related Party | $ 34,000 | $ 118,000 | 120,000 | $ 268,000
Proceeds from Dividends Received |  |  | $ 123,000 | $ 105,000

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