Note 8 - Warrants - Schedule of Warrants (Details)	3 Months Ended
	Mar. 31, 2023 $ / shares shares		Mar. 31, 2023 $ / shares shares
Warrants outstanding (in shares)	17,400,000		17,400,000
Warrants outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 0.28
Number of warrants exercisable (in shares)	4,900,000		4,900,000
Warrants Expiring on April 19, 2023 [Member]
Warrants outstanding (in shares)	4,900,000		4,900,000
Exercise price (in CAD per share) | $ / shares			$ 1.00
Number of warrants exercisable (in shares)	4,900,000		4,900,000
Remaining contractual life (Year)	18 days
Warrants Expiring on June 4, 2025 [Member]
Warrants outstanding (in shares)	12,500,000		12,500,000
Exercise price (in CAD per share) | $ / shares	$ 0.001	[1]
Remaining contractual life (Year)	2 years 2 months 4 days

[1] No share purchase warrants are exercisable until specific performance criteria have been met. Such criteria being 1) revenue sales projections per CTI's 5-year proformas, or 2) listing on a major US exchange, or 3) change of control.