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Note 11 - Reclassifications of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Periodic Pension Costs [Member] | Defined Benefit Pension Items [Member]    
Net periodic pension cost $ (255) $ (130)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Associated Tax Expense Benefit [Member] | Defined Benefit Pension Items [Member]    
Associated tax benefit (expense) 95 46
Reclassification out of Accumulated Other Comprehensive Income [Member] | Associated Tax Expense Benefit [Member] | Gains (Losses) on Cash Flow Hedges [Member]    
Associated tax benefit (expense) (55) (1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain on Cash Flow Derivative [Member] | Gains (Losses) on Cash Flow Hedges [Member]    
Net sales 148 4
Reclassification out of Accumulated Other Comprehensive Income [Member] | Hedge Ineffectiveness [Member] | Gains (Losses) on Cash Flow Hedges [Member]    
Net sales (1) (2)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Pension Items [Member]    
Net income (loss) (160) (84)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) on Cash Flow Hedges [Member]    
Net income (loss) 92 1
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Net income (loss) (68) (83)
Net periodic pension cost (192,259) (269,689)
Associated tax benefit (expense) 8,642 (4,364)
Net income (loss) (15,695) (3,891)
Net sales $ 191,046 $ 301,140