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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Settlement loss   $ (1,000)   $ (4,400)
Total before income tax $ (11,056) (8,999) $ (29,282) (22,956)
Income tax 2,274 1,738 5,974 4,575
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Recognized actuarial loss [1] 568 615 1,917 1,903
Settlement loss [1] 388 991 2,116 4,373
Total before income tax 956 1,606 4,033 6,276
Income tax (230) (364) (944) (1,443)
Net of income tax $ 726 $ 1,242 $ 3,089 $ 4,833
[1] The recognized actuarial loss and the settlement loss are included in Other income (expense), net in the Consolidated Statements of Income.