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Note 8 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes Paid $ 7,900 $ 6,200 $ 9,100  
Tax Credit Carryforward, Amount 600 700    
Deferred Tax Assets, Valuation Allowance, Total 481 567    
Unrecognized Tax Benefits, Ending Balance 808 878 1,130 $ 951
Unrecognized Tax Benefits that Would Impact Effective Tax Rate   700    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total $ 200 $ 200 $ 300