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Note 8 - Share-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-Based Payment Arrangement, Expense $ 276 $ 370 $ 654 $ 719
Restricted Stock [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     3 years  
Share-Based Payment Arrangement, Expense     $ 400 $ 300