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Note 6 - Income Taxes - Summary of Income Tax Contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Balance $ 414,042 [1] $ 399,292 [1] $ 404,571
Additions from GulfMark business combination     8,857
Additions based on tax positions related to a prior year 2,223 1,964 6,903
Settlement and lapse of statute of limitations (64,458) (1,897) (2,953)
Reductions based on tax positions related to a prior year (760) (58) (18,086)
Additions based on tax positions related to the current year   14,741  
Balance [1] $ 351,047 $ 414,042 $ 399,292
[1] The gross balance reported as uncertain tax positions is largely offset by $335.0 million of foreign tax credits and other tax attributes.