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Note 12 - Accumulated Other Comprehensive Loss - Reclassification of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Cost of sales $ 60,985 $ 30,023 $ 117,057 $ 62,040
Net income (loss) 2,974 (5,686) 5,139 (7,637)
Revenue from Contract with Customer, Including Assessed Tax 69,203 28,785 131,846 62,150
Associated income tax (expense) benefit (447) 108 (638) 380
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Net income (loss) (3) (1) (2)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Cost of sales (3) (6)
Net income (loss) (3) (6)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Net income (loss) 5 (2)
Revenue from Contract with Customer, Including Assessed Tax 7 (3)
Associated income tax (expense) benefit $ (2) $ 1