Note 7 - Share-based Compensation - Stock Option Transactions (Details) $ / shares in Units, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($) $ / shares shares		Dec. 31, 2021 USD ($) $ / shares shares
Outstanding, options (in shares) | shares	779,938
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 16.12
Outstanding, weighted average remaining life (Year)	3 years 1 month 17 days		3 years 3 months 7 days
Outstanding, aggregate intrinsic value | $	$ 2,608		$ 5,097
Granted (in shares) | shares	103,203	[1]
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 20.13
Exercised (in shares) | shares	(53,417)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 11.95
Lapsed or cancelled (in shares) | shares	(7,572)
Lapsed or cancelled, weighted average exercise price (in dollars per share) | $ / shares	$ 17.89
Outstanding, options (in shares) | shares	822,152		779,938
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 16.88		$ 16.12
Exercisable, options (in shares) | shares	550,456
Exercisable, weighted average exercise price, options (in dollars per share) | $ / shares	$ 13.96
Exercisable, weighted average remaining life, options (Year)	2 years 6 months 29 days
Exercisable, aggregate intrinsic value, options | $	$ 2,608

[1] The weighted average grant date fair value of stock options granted was $7.84 per share.