Note 3 - Inventories - Summary of Inventory (Details) - USD ($)	Dec. 31, 2019	Mar. 31, 2019
Raw materials	$ 559,637	$ 357,760
Finished goods	49,060	54,005
Totals	608,697	411,765
Current [Member]
Raw materials	474,916	273,039
Finished goods	48,324	53,269
Totals	523,240	326,308
Long Term [Member
Raw materials	84,721	84,721
Finished goods	736	736
Totals	$ 85,457	$ 85,457

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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