Note 4 - Intangible Assets - Intangible Assets (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Cost	$ 50,309		$ 50,309
Accumulated amortization	35,242		27,936
Net carrying amount	15,067		22,373
Accumulated amortization	(35,242)		(27,936)
Intangible assets, net of accumulated amortization of $35,242 and $27,936 at March 31, 2025 and March 31, 2024, respectively	$ 15,067		$ 22,373
Minimum [Member]
Finite-Lived Intangible Assets, Useful Life (Year)	10 years
Maximum [Member]
Finite-Lived Intangible Assets, Useful Life (Year)	15 years
Patents And Trademarks [Member]
Cost	$ 35,794
Finite-Lived Intangible Assets, Useful Life (Year)			15 years
Accumulated amortization	27,982		$ 25,516
Net carrying amount			10,278
Accumulated amortization	(27,982)		(25,516)
Intangible assets, net of accumulated amortization of $35,242 and $27,936 at March 31, 2025 and March 31, 2024, respectively			10,278
Patents And Trademarks [Member] \| Minimum [Member]
Cost			$ 35,794
Finite-Lived Intangible Assets, Useful Life (Year)		10 years	10 years
Net carrying amount	7,812
Intangible assets, net of accumulated amortization of $35,242 and $27,936 at March 31, 2025 and March 31, 2024, respectively	$ 7,812
Patents And Trademarks [Member] \| Maximum [Member]
Finite-Lived Intangible Assets, Useful Life (Year)	15 years
Software [Member]
Cost	$ 14,515		$ 14,515
Finite-Lived Intangible Assets, Useful Life (Year)	3 years		3 years
Accumulated amortization	$ 7,260		$ 2,420
Net carrying amount	7,255		12,095
Accumulated amortization	(7,260)		(2,420)
Intangible assets, net of accumulated amortization of $35,242 and $27,936 at March 31, 2025 and March 31, 2024, respectively	$ 7,255		$ 12,095

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