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Note 4 - Intangible Assets - Intangible Assets (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Accumulated Amortization $ (20,741) $ (19,751)
Intangible assets, net of accumulated amortization of $20,741 and $19,751 at June 30, 2022 and March 31, 2022, respectively 15,323 16,043
Net Carrying Amount 15,323 16,043
Patents And Trademarks [Member]    
Cost 35,794 35,794
Accumulated Amortization (20,471) (19,751)
Intangible assets, net of accumulated amortization of $20,741 and $19,751 at June 30, 2022 and March 31, 2022, respectively 15,323 16,043
Net Carrying Amount $ 15,323 $ 16,043
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