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Note 8 - Income Taxes - Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Balance at beginning of year $ 878 $ 1,130 $ 951
Additions based on tax positions related to the current year 153 177 372
Reductions due to lapse of applicable statute of limitations (96) (139) (193)
Settlements (127) (290) 0
Balance at end of year $ 808 $ 878 $ 1,130