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Other current assets (Details) - USD ($) | Jan. 31, 2024 | Apr. 30, 2023
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Prepaid expenses | $ 1,152,751 | $ 752,564
Prepaid inventory | 970,542 | 359,500
Grant receivable | 675,000 |
Accrued interest income |  | 151,671
Total | $ 2,798,293 | $ 1,263,735

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