Inventory (Details) - USD ($)	Feb. 28, 2022	May 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 497,309	$ 503,344
Work-in-process	5,200,533	5,076,377
Finished goods	334,324	355,875
Gross inventory	6,032,166	5,935,596
Less allowance for obsolescence	100,000	100,000
Net inventory	$ 5,932,166	$ 5,835,596

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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