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Note 7 - Income Taxes - Changes in Uncertain Tax Positions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Balance at the beginning of the period $ 35,377 $ 32,515
Additions attributable to the Merger 40,144 0
Additions based on tax positions related to current period not attributable to the Merger 5,774 2,182
Additions for tax positions of prior year period not attributable to the Merger 5,094 1,787
Settlements with tax authorities (2,370) (665)
Reductions for tax positions of prior years (5,138) (763)
Reductions due to the lapse of statute of limitations (2,094) (188)
Effect of changes in foreign exchange rates, decrease (673)  
Effect of changes in foreign exchange rates, increase   509
Balance at the end of the period $ 76,114 $ 35,377