v3.25.4
Note 4 - Intangible Assets - Intangible Assets (Details) - USD ($)
Dec. 31, 2025
Mar. 31, 2025
Cost $ 50,309 $ 50,309
Accumulated amortization 40,389 35,242
Net carrying amount 9,920 15,067
Accumulated amortization (40,389) (35,242)
Intangible assets, net of accumulated amortization of $40,389 and $35,242 at December 31, 2025 and March 31, 2025, respectively 9,920 15,067
Patents And Trademarks [Member]    
Cost 35,794 35,794
Accumulated amortization 29,499 27,982
Net carrying amount 6,295 7,812
Accumulated amortization (29,499) (27,982)
Intangible assets, net of accumulated amortization of $40,389 and $35,242 at December 31, 2025 and March 31, 2025, respectively $ 6,295 $ 7,812
Patents And Trademarks [Member] | Minimum [Member]    
Finite-Lived Intangible Assets, Useful Life (Year) 10 years 10 years
Patents And Trademarks [Member] | Maximum [Member]    
Finite-Lived Intangible Assets, Useful Life (Year) 15 years 15 years
Software [Member]    
Cost $ 14,515 $ 14,515
Finite-Lived Intangible Assets, Useful Life (Year) 3 years 3 years
Accumulated amortization $ 10,890 $ 7,260
Net carrying amount 3,625 7,255
Accumulated amortization (10,890) (7,260)
Intangible assets, net of accumulated amortization of $40,389 and $35,242 at December 31, 2025 and March 31, 2025, respectively $ 3,625 $ 7,255