Note 10 - Share-based Compensation - Summary of Stock Option Activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
Options on Common Shares, Outstanding (in shares) | shares	5,491,399
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 3.72
Outstanding, remaining contractual term (Year)	7 years 7 months 24 days	5 years 11 months 15 days
Outstanding, aggregate intrinsic value | $	$ 10	$ 92
Options on Common Shares, Granted (in shares) | shares	60,000
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 1.34
Options on Common Shares, Exercised (in shares) | shares	(250)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 1.50
Options on Common Shares, Forfeited, cancelled, expired (in shares) | shares	(3,329,476)
Forfeited, cancelled, expired, weighted average exercise price (in dollars per share) | $ / shares	$ 5.54
Options on Common Shares, Outstanding (in shares) | shares	2,221,673	5,491,399
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 3.56	$ 3.72
Options on Common Shares, Exercisable (in shares) | shares	1,033,504
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 4.37
Exercisable, remaining contractual term (Year)	7 years 7 days
Exercisable, aggregate intrinsic value | $	$ 0