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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
Mar. 31, 2021
Mar. 31, 2020
Total before income tax $ (9,318) $ (6,890)
Income tax 1,889 1,404
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Recognized actuarial loss [1] 660 590
Settlement loss [2] 0 1,478
Total before income tax 660 2,068
Income tax (148) (489)
Net of income tax $ 512 $ 1,579
[1] The recognized actuarial loss is included in the computation of net periodic benefit cost. See Note 9 to the Consolidated Financial Statements, Pensions and Other Postretirement Benefits
[2] The settlement loss is included in Other (expense) income, net in the Consolidated Statements of Income