Note 9 - Share-based compensation - Stock Option Activity (Details) - Common Stock [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Weighted average grant date fair value of stock options granted (in dollars per share)	$ 11.12	$ 13.29	$ 9.43
Intrinsic value of stock options exercised (in thousands)	$ 1,275	$ 2,037	$ 648
Intrinsic value of stock options vested (in thousands)	$ 146	$ 3,894	$ 4,369