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Note 8 - Accumulated Other Comprehensive Income (Loss) - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Total before income tax $ (13,435) $ (12,586) $ (22,677) $ (25,242)
Income tax 2,955 2,413 4,975 5,452
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Recognized actuarial loss [1] 479 317 877 611
Settlement loss [2] 2,229 2,616
Total before income tax 479 2,546 877 3,227
Income tax (101) (625) (183) (796)
Net of income tax $ 378 $ 1,921 $ 694 $ 2,431
[1] The recognized actuarial loss is included in Other income (expense), net in the Consolidated Statements of Income.
[2] The settlement loss is included in Other income (expense), net in the Consolidated Statements of Income.