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Note 8 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Beginning balance $ 730 $ 956 $ 624
Additions based on tax positions related to prior tax years 283 0 332
Reductions based on tax positions related to prior tax years 0 (226) 0
Additions based on tax positions related to current tax year 52 0 0
Ending balance $ 1,065 $ 730 $ 956