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Note 12 - Accumulated Other Comprehensive Loss - Reclassification of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Cost of sales $ 47,252 $ 36,811 $ 109,292 $ 93,171
Other income (loss) 59 (81) 249 (54)
Tax (expense) benefit 3,456 41 3,836 1,607
Net income (loss) 27,801 (2,069) 20,164 (8,005)
Net sales 52,455 38,804 114,605 97,153
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Net income (loss) 9 (62) 7 (191)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Cost of sales (3) (8)
Other income (loss) (78) (235)
Tax (expense) benefit 14 48
Net income (loss) (67) (195)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Tax (expense) benefit (3) (4) (2) (3)
Net income (loss) 9 5 7 4
Net sales $ 12 $ 9 $ 9 $ 7