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Note 7 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability $ (32,000)   $ (21,000)
Deferred Tax Assets, Valuation Allowance, Total 0 $ 0  
Income Tax Examination, Penalties and Interest Accrued Liabilities (Receivables) (1,000) 8,000  
Income Tax Examination, Penalties and Interest Expense (Benefit) (5,000) 5,000 (4,000)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 31,000 $ 52,000 $ 39,000