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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Settlement loss $ 1,900   $ 3,400  
Total before income tax (8,909) $ (7,067) (18,227) $ (13,957)
Income tax 1,812 1,433 3,701 2,837
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Recognized actuarial loss [1] 689 698 1,349 1,287
Settlement loss [1] 1,728 1,904 1,728 3,382
Total before income tax 2,417 2,602 3,077 4,669
Income tax (560) (590) (714) (1,078)
Net of income tax $ 1,857 $ 2,012 $ 2,363 $ 3,591
[1] The recognized actuarial loss and the settlement loss are included in Other income (expense), net in the Consolidated Statements of Income.