Note 4 - Intangible Assets - Intangible Assets (Details) - USD ($)	9 Months Ended	12 Months Ended
Dec. 31, 2022	Mar. 31, 2022
Patents & Trademarks	$ (21,911)	$ (19,751)
Intangible assets, net of accumulated amortization of $21,911 and $19,751 at December 31, 2022 and March 31, 2022, respectively	13,883	16,043
Patents & Trademarks	13,883	16,043
Patents And Trademarks [Member]
Patents & Trademarks	35,794	35,794
Patents & Trademarks	(21,911)	(19,751)
Intangible assets, net of accumulated amortization of $21,911 and $19,751 at December 31, 2022 and March 31, 2022, respectively	13,883	16,043
Patents & Trademarks	$ 13,883	$ 16,043
Patents And Trademarks [Member] \| Minimum [Member]
Patents & Trademarks (Year)	10 years	10 years
Patents And Trademarks [Member] \| Maximum [Member]
Patents & Trademarks (Year)	15 years	15 years

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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