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Note 6 - Income Taxes - Components of Income Tax Expense Benefit (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current, federal $ (21,005) $ 649 $ 962
Current, state 0 0 0
Current, non-U.S. 18,816 26,403 16,718
Current, total (2,189) 27,052 17,680
Deferred, federal (30) 672 531
Deferred, state 0 0 250
Deferred, non-U.S. 1,254 0 (209)
Deferred, total 1,224 672 572
Federal (21,035) 1,321 1,493
State 0 0 250
Non-U.S. 20,070 26,403 16,509
Income Tax Expense (Benefit), Total $ (965) $ 27,724 $ 18,252