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Note 15 - Income Taxes - Unrecognized Tax Benefits Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Balance $ 28 $ 28 $ 27
Change in tax due to tax law 0 0 0
Increases related to current year tax positions 8 8 10
Increases related to prior year tax positions 200 0 0
Decreases related to lapsing of statute of limitations (8) (8) (9)
Balance $ 228 $ 28 $ 28