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Note 8 - Accumulated Other Comprehensive Income (Loss) - Reclassification Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Total before income tax $ (7,067) $ (13,435) $ (13,957) $ (22,677)
Income tax 1,433 2,955 2,837 4,975
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Recognized actuarial loss [1] 698 479 1,287 877
Settlement loss [1] 1,904 0 3,382 0
Total before income tax 2,602 479 4,669 877
Income tax (590) (101) (1,078) (183)
Net of income tax $ 2,012 $ 378 $ 3,591 $ 694
[1] The recognized actuarial loss and the settlement loss are included in Other income (expense), net in the Consolidated Statements of Income.