Note 8 - Share-based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Stock-based compensation	$ 1,610	$ 1,313	$ 4,829	$ 3,915
Share-Based Payment Arrangement, Option [Member]
Stock-based compensation	744	676	2,217	2,009
Restricted Stock Units (RSUs) [Member]
Stock-based compensation	556	481	1,690	1,443
Performance-based Restricted Units [Member]
Stock-based compensation	$ 310	$ 156	$ 922	$ 463