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Note 18 - Accumulated Other Comprehensive Loss - Reclassification of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cost of sales                 $ 160,053   $ 126,965 $ 149,323
Other income (loss)                 267   201 (357)
Tax (expense) benefit                 3,252   1,100 4,098
Net income (loss) $ 148 [1] $ 27,801 [1] $ (5,686) [1] $ (1,951) [1] $ (2,158) $ (2,069) $ (2,068) $ (3,868) 20,312 [1] $ 20,312 (10,163) (9,263)
Net sales $ 57,544 $ 52,455 $ 28,785 $ 33,365 $ 35,627 $ 38,804 $ 28,692 $ 29,657 172,149   132,780 149,387
Reclassification out of Accumulated Other Comprehensive Income [Member]                        
Net income (loss)                 61   (228)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                        
Cost of sales                 (11)   (11) (11)
Other income (loss)                 52   8 (381)
Tax (expense) benefit                 8   136
Net income (loss)                 49   (3) (256)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]                        
Tax (expense) benefit                 (1)   (2) (17)
Net income (loss)                 12   3 28
Net sales                 $ 13   $ 5 $ 45
[1] Net income for the third quarter of 2018 includes a preliminary bargain purchase gain of $21.9 million. Net income for the fourth quarter of 2018 includes a measurement period adjustment of $1.8 million to decrease the bargain purchase gain.