Note 7 - Share-based Compensation - Stock Option Transactions (Details) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares		Dec. 31, 2022 USD ($) $ / shares shares
Outstanding, options (in shares) | shares	962,775
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 15.89
Outstanding, weighted average remaining life (Year)	3 years 7 days		3 years 3 months 3 days
Outstanding, aggregate intrinsic value | $	$ 8		$ 301
Granted (in shares) | shares	215,006	[1]
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 11.8	[1]
Exercised (in shares) | shares	(12,118)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 8.01
Lapsed or cancelled (in shares) | shares	(165,998)
Lapsed or cancelled, weighted average exercise price (in dollars per share) | $ / shares	$ 17.99
Outstanding, options (in shares) | shares	999,665		962,775
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 14.76		$ 15.89
Exercisable, options (in shares) | shares	524,910
Exercisable, weighted average exercise price, options (in dollars per share) | $ / shares	$ 16.11
Exercisable, weighted average remaining life (Year)	1 year 10 months 2 days
Exercisable, aggregate intrinsic value, options | $	$ 8

[1] The weighted average grant date fair value of stock options granted was $4.36 per share.