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Note 11 - Accumulated Other Comprehensive Loss - Reclassification of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cost of sales $ 56,072 $ 32,017
Net income (loss) 2,165 (1,951)
Revenue from Contract with Customer, Including Assessed Tax 62,643 33,365
Associated income tax (expense) benefit (191) 272
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Net income (loss) 2 (2)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Cost of sales (3)
Net income (loss) (3)
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