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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Total before income tax $ (8,999) $ (11,907) $ (22,956) $ (34,584)
Income tax 1,738 2,132 4,575 7,107
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Recognized actuarial loss [1] 615 438 1,903 1,315
Settlement loss [1] 991 0 4,373 0
Total before income tax 1,606 438 6,276 1,315
Income tax (364) (98) (1,443) (281)
Net of income tax $ 1,242 $ 340 $ 4,833 $ 1,034
[1] The recognized actuarial loss and the settlement loss are included in Other income (expense), net in the Consolidated Statements of Income.