Inventories (Details) - USD ($)	Oct. 31, 2021	Apr. 30, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 1,033,801
Work-in-process	176,522
Finished goods	775,184	362,072
Total	$ 1,985,507	$ 362,072

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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