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Note 7 - Income Taxes - Changes in Uncertain Tax Positions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Balance at the beginning of the period $ 88,137 $ 76,114
Additions attributable to the Merger 0 7,259
Additions based on tax positions related to current period not attributable to the Merger 3,042 8,009
Additions for tax positions of prior year period not attributable to the Merger 2,125 2,371
Settlements with tax authorities (1,945) (2,490)
Reductions for tax positions of prior years (714) (547)
Reductions due to the lapse of statute of limitations (976) (1,525)
Effect of changes in foreign exchange rates (25) (1,054)
Balance at the end of the period $ 89,644 $ 88,137