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Other current assets (Details) - USD ($) | Jul. 31, 2024 | Apr. 30, 2024
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Prepaid expenses | $ 2,387,937 | $ 1,206,306
Prepaid inventory | 204,742 | 602,888
Contract asset | 0 | 1,477,859
Grant receivable |  | 675,000
Total | $ 2,592,679 | $ 3,962,053

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