Note 12 - Share-based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Options on Common Shares, Outstanding (in shares)	3,935,883
Outstanding, weighted average exercise price (in dollars per share)	$ 5.24
Outstanding, remaining contractual term (Year)	5 years 11 months 15 days	4 years 9 months 14 days
Options on Common Shares, Granted (in shares)	4,153,885
Granted, weighted average exercise price (in dollars per share)	$ 3.64
Options on Common Shares, Exercised (in shares)	(55,500)
Exercised, weighted average exercise price (in dollars per share)	$ 1.50
Options on Common Shares, Forfeited, cancelled, expired (in shares)	(2,542,869)
Forfeited, cancelled, expired, weighted average exercise price (in dollars per share)	$ 5.79
Options on Common Shares, Outstanding (in shares)	5,491,399	3,935,883
Outstanding, weighted average exercise price (in dollars per share)	$ 3.72	$ 5.24
Outstanding, aggregate intrinsic value	$ 92
Exercisable, shares (in shares)	2,465,110
Exercisable, weighted average exercise price (in dollars per share)	$ 4.55
Exercisable, weighted average contractual term (Year)	2 years 1 month 17 days
Exercisable, aggregate intrinsic value	$ 92