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Investment in Morion, Inc. (Details) - Morion Inc [Member] - USD ($) | 12 Months Ended
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Apr. 30, 2020 | Apr. 30, 2019
Investment in Morion, Inc. (Details) [Line Items] |  |
Cost Method Investment Ownership Percentage | 4.60% |
Investment Owned, at Cost | $ 800,000 |
Related Party Transaction, Purchases from Related Party | 888,000 | $ 437,000
Revenue from Related Parties | 85,000 | 2,000
Accounts Receivable, Related Parties, Current |  | 38,000
Proceeds from Dividends Received | $ 250,000 | $ 105,000

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