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Note 11 - Accumulated Other Comprehensive Loss - Reclassification of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Cost of sales $ 30,023 $ 27,946 $ 62,040 $ 56,360
Other income (loss) 20 116 190 27
Tax (expense) benefit 108 1,404 380 1,566
Net loss (5,686) (2,068) (7,637) (5,936)
Net sales 28,785 28,692 62,150 58,349
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Net loss (47) (2) (129)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Cost of sales (2) (5)
Other income (loss) (79) (157)
Tax (expense) benefit 30 34
Net loss (51) (128)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Tax (expense) benefit (2) 1 1
Net loss 4 (2) (1)
Net sales $ 6 $ (3) $ (2)