Note 9 - Share-based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Stock-based compensation	$ 1,609	$ 1,312	$ 3,219	$ 2,602
Share-Based Payment Arrangement, Option [Member]
Stock-based compensation	732	671	1,473	1,333
Restricted Stock Units (RSUs) [Member]
Stock-based compensation	573	485	1,134	962
Performance-based Restricted Units [Member]
Stock-based compensation	$ 304	$ 156	$ 612	$ 307