Note 8 - Share-based Compensation - Stock Option Activity (Details) - Common Stock [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Weighted average grant date fair value of stock options granted (in dollars per share)	$ 2.78	$ 11.12	$ 13.29
Intrinsic value of stock options exercised (in thousands)	$ 75	$ 1,275	$ 2,037
Intrinsic value of stock options vested (in thousands)	$ 518	$ 146	$ 3,894