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Other current assets (Details) - USD ($)
Apr. 30, 2023
Apr. 30, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid inventory $ 2,421,538 $ 1,707,085
Accrued interest income 151,671 385,730
Prepaid expenses 759,964 262,069
Total $ 3,333,173 $ 2,354,884