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Note 11 - Warrants - Summary of Outstanding Warrants (Details) - Warrants Classified as Liability [Member] - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Balance, warrants (in shares)	5,824,027
Balance, warrants, weighted average exercise price (in dollars per share)	$ 6.56
Balance, warrants, weighted average remaining contractual life (Year)	3 years 9 months 3 days	4 years 2 months 15 days
Warrants expired, warrants (in shares)	(68,508)
Warrants expired, warrants, weighted average exercise price (in dollars per share)	$ 10.40
Balance, warrants (in shares)	5,755,519	5,824,027
Balance, warrants, weighted average exercise price (in dollars per share)	$ 6.51	$ 6.56