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Note 7 - Income Taxes - Reconciliation of Differences Between Income Tax Provision Computed and Statutory Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statutory tax rate 25.80% 25.00% 19.00%
Income tax expense (benefit) at statutory rate $ 1,387 $ (33,093) $ (61,566)
Permanent differences 12,187 14,123 120,239
Effect of overseas tax rates (4,024) 9,905 (1,754)
Net tax charge related to attributes with full valuation allowance 28,267 28,607 (71,259)
Exempt dividends from joint ventures (2,649) (1,014) 14
Return to provision adjustments (5,966) (5,001) 6,150
Withholding taxes 3,029 1,995 984
Foreign exchange movements on tax balances 694 67 1,216
Movement in uncertain tax positions 8,322 678 2,576
Income tax expense (benefit) $ 41,247 $ 16,267 $ (3,400)
Effective tax rate 768.00% (12.30%) 1.00%