Note 7 - Share-based Compensation - Stock Option Transactions (Details) $ / shares in Units, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 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 2 months 26 days		3 years 3 months 3 days
Outstanding, aggregate intrinsic value | $	$ 158		$ 301
Granted (in shares) | shares	215,006	[1]
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 11.80	[1]
Exercised (in shares) | shares	(5,604)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 7.66
Lapsed or cancelled (in shares) | shares	(133,173)
Lapsed or cancelled, weighted average exercise price (in dollars per share) | $ / shares	$ 18.52
Outstanding, options (in shares) | shares	1,039,004		962,775
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 14.75		$ 15.89
Exercisable, options (in shares) | shares	526,412
Exercisable, weighted average exercise price, options (in dollars per share) | $ / shares	$ 15.81
Exercisable, weighted average remaining life (Year)	2 years
Exercisable, aggregate intrinsic value, options | $	$ 144

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