Note 5 - Intangible Assets - Intangible Assets (Details) - USD ($)	3 Months Ended	12 Months Ended
Jun. 30, 2021	Mar. 31, 2021
Accumulated Amortization	$ (17,591)	$ (16,871)
Net Carrying Amount	18,203	18,923
Patents And Trademarks [Member]
Cost	35,794	35,794
Accumulated Amortization	(17,591)	(16,871)
Net Carrying Amount	$ 18,203	$ 18,923
Patents And Trademarks [Member] \| Minimum [Member]
Weighted Average Amortization Period (Years) (Year)	10 years	10 years
Patents And Trademarks [Member] \| Maximum [Member]
Weighted Average Amortization Period (Years) (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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
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