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Note 13 - Share-based Compensation - Compensation Cost (Details) - Selling, General and Administrative Expenses [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based compensation $ 3,208 $ 2,428 $ 1,807
Common Stock [Member]      
Share-based compensation 400 400 400
Employee and Nonemployee Stock Option [Member]      
Share-based compensation 263 210 232
Restricted Stock Units (RSUs) [Member]      
Share-based compensation $ 2,545 $ 1,818 $ 1,175