Note 3 - Inventories - Summary of Inventory (Details) - USD ($)	Jun. 30, 2020	Mar. 31, 2020
Raw materials	$ 496,660	$ 410,382
Finished goods	87,518	94,333
Totals	584,178	504,715
Current [Member]
Raw materials	375,647	289,369
Finished goods	76,451	83,266
Totals	452,098	372,635
Long Term [Member
Raw materials	121,013	121,013
Finished goods	11,067	11,067
Totals	$ 132,080	$ 132,080

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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