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Note 8 - Accumulated Other Comprehensive Loss - Schedule of Reclassifications of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Tax (expense) benefit $ 1,375 $ 131 $ 1,596 $ 663
Cost of sales (28,643) (44,223) (57,529) (83,588)
Tax (expense) benefit 1,375 131 1,596 663
Net income (loss) (2,068) (6,242) (5,936) (15,825)
Net sales $ 28,692 $ 42,061 58,358 75,989
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Net income (loss)     (129) (106)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Tax (expense) benefit     34 6
Cost of sales     (162) (142)
Tax (expense) benefit     34 6
Net income (loss)     (128) (136)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]        
Tax (expense) benefit     1 (17)
Tax (expense) benefit     1 (17)
Net income (loss)     (1) 30
Net sales     (2) 48
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Hedge Ineffectiveness [Member]        
Net sales     $ (1)