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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, 2020
Mar. 31, 2019
Total before income tax $ (6,890) $ (9,242)
Income tax 1,404 2,020
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Recognized actuarial loss [1] 590 398
Settlement loss [2] 1,478
Total before income tax 2,068 398
Income tax (489) (82)
Net of income tax $ 1,579 $ 316
[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.