Note 5 - Capital Stock and Additional Paid in Capital - Summary of Stock Option Activity (Details)	12 Months Ended
	Dec. 31, 2023 $ / shares shares	Dec. 31, 2022 $ / shares shares	Dec. 31, 2022 $ / shares shares	Dec. 31, 2021 $ / shares shares	Dec. 31, 2021 $ / shares shares
Outstanding (in shares)	34,665,000	34,615,000	34,615,000
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 0.14		$ 0.18
Granted (in shares)	11,400,000	5,700,000	5,700,000
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 0.035		$ 0.09
Exercised (in shares)		(900,000)	(900,000)	(3,125,000)	(3,125,000)
Exercised, weighted average exercise price (in dollars per share) | (per share)		$ 0.15	$ 0.15	$ 0.12
Expired (in shares)	(6,050,000)	(4,750,000)	(4,750,000)
Expired, weighted average exercise price (in dollars per share) | $ / shares	$ 0.22		$ 0.37
Outstanding (in shares)	40,015,000	34,665,000	34,665,000	34,615,000	34,615,000
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 0.1		$ 0.14		$ 0.18
Number currently exercisable (in shares)	40,015,000
Number currently exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 0.1