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Amortized cost, net unrealized gains or losses, and fair values (Details) | 12 Months Ended
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Apr. 30, 2022 USD ($)
Available For Sale Securities Amortized Cost [Member] |
Money market funds | $ 799,047
Asset-backed securities | 2,894,512
Corporate bonds | 42,571,104
Total | 46,264,663
Available For Sale Securities Fair Value [Member] |
Money market funds | 799,936
Asset-backed securities | 2,861,559
Corporate bonds | 41,128,874
Total | 44,790,369
Available For Sale Securities Unrealized Gain Loss [Member] |
Debt Securities, Available-for-Sale, Unrealized Gain (Loss) | 889
Asset Backed Securities Net Unrealized Gain Losses [Member] |
Debt Securities, Available-for-Sale, Unrealized Gain (Loss) | (32,953)
Corporate Bonds Unrealized Gain Losses [Member] |
Debt Securities, Available-for-Sale, Unrealized Gain (Loss) | (1,442,230)
Available For Sale Securities Net Unrealized Gain Losses [Member] |
Debt Securities, Available-for-Sale, Unrealized Gain (Loss) | $ (1,474,294)

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