Note 3 - Inventories - Summary of Inventory (Details) - USD ($)	Jun. 30, 2021	Mar. 31, 2021
Raw materials	$ 429,315	$ 342,207
Finished goods	64,754	96,661
Totals	494,069	438,868
Current [Member]
Raw materials	226,469	139,361
Finished goods	55,966	87,873
Totals	282,435	227,234
Long Term [Member
Raw materials	202,846	202,846
Finished goods	8,788	8,788
Totals	$ 211,634	$ 211,634

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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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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

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