Note 13 - Share-based Compensation - Compensation Cost (Details) - Selling, General and Administrative Expenses [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Total share-based compensation	$ 4,641	$ 3,208	$ 2,428
RSUs	4,641	3,208	2,428
Common Stock [Member]
Total share-based compensation	400	400	400
RSUs	400	400	400
Employee and Nonemployee Stock Option [Member]
Total share-based compensation	432	263	210
RSUs	432	263	210
Restricted Stock Units (RSUs) [Member]
Total share-based compensation	3,809	2,545	1,818
RSUs	$ 3,809	$ 2,545	$ 1,818