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Note 8 - Accumulated Other Comprehensive Loss - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Total before income tax $ (9,242) $ (12,656)
Income tax 2,020 3,039
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Recognized actuarial loss [1] 398 294
Settlement loss [2] 387
Total before income tax 398 681
Income tax (82) (171)
Net of income tax $ 316 $ 510
[1] The recognized actuarial loss is included in Other income (expense), net in the Consolidated Statements of Income.
[2] The settlement loss is included in Other income (expense), net in the Consolidated Statements of Income.