Note 9 - Share-based Compensation - Summary of Stock Option Activity (Details) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 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)	8 years 29 days	5 years 11 months 15 days
Outstanding, aggregate intrinsic value | $	$ 7	$ 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	$ 1.5
Options on Common Shares, Forfeited, cancelled, expired (in shares) | shares	(1,982,900)
Forfeited, cancelled, expired, weighted average exercise price (in dollars per share) | $ / shares	$ 4.14
Options on Common Shares, Outstanding (in shares) | shares	3,568,249	5,491,399
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 3.37	$ 3.72
Options on Common Shares, Exercisable (in shares) | shares	1,052,714
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 4.56
Exercisable, remaining contractual term (Year)	6 years 9 months 14 days
Exercisable, aggregate intrinsic value | $	$ 0