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Note 7 - Accumulated Other Comprehensive Loss - Reclassification Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Settlement loss $ 0 $ (2,900) $ (4,000)
Total before income tax (45,166) (50,316) (39,378)
Income tax 9,351 10,337 12,823
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Recognized actuarial loss [1] 1,753 1,164 1,093
Settlement loss [2] 2,852 4,031
Total before income tax 1,753 4,016 5,124
Income tax (363) (823) (1,670)
Net of income tax $ 1,390 $ 3,193 $ 3,454
[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.