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Note 10 - Accumulated Other Comprehensive Loss - Reclassification of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cost of sales $ 32,017 $ 28,414
Other income (loss) 170 (89)
Tax (expense) benefit 272 162
Net loss (1,951) (3,868)
Net sales 33,365 29,657
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Net loss (2) (82)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Cost of sales (3)
Other income (loss) (78)
Tax (expense) benefit 4
Net loss (77)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Hedge Ineffectiveness [Member]    
Tax (expense) benefit 1 3
Net loss (2) (5)
Net sales $ (3) $ (8)