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 |