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Note 10 - Warrants - Summary of Outstanding Warrants (Details) - Warrants Classified as Liability [Member] - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Balance, warrants (in shares)	4,587,002	5,824,027
Balance, warrants, weighted average exercise price (in dollars per share)	$ 4.9	$ 6.56
Balance, warrants, weighted average remaining contractual life (Year)	3 years 1 month 9 days	4 years 1 month 9 days	4 years 2 months 15 days
Warrants expired (in shares)	0	(1,237,025)
Warrants expired, warrants, weighted average exercise price (in dollars per share)	$ 0	$ 12.7
Balance, warrants (in shares)	4,587,002	4,587,002	5,824,027
Balance, warrants, weighted average exercise price (in dollars per share)	$ 4.9	$ 4.9	$ 6.56