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Note 14 - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Actuarial Losses [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Other expense [1] $ (192) $ (307)
Prior Service Credits [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Other expense [1] 11 11
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Total before tax (181) (296)
Tax benefit 78 128
Net income (103) (168)
Total before tax 15,176 14,279
Tax benefit 5,615 5,546
Net income $ 9,561 $ 8,733
[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (See Note 10 of the Notes to Consolidated Financial Statements “Pension and Other Postretirement Benefit Plans”.)