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Note 2 - Revenue Recognition - Revenue Disaggregated by the Major Types of Good and Services Sold (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net sales $ 42,931 $ 37,053
Product [Member]    
Net sales 42,440 36,657
Tooling [Member]    
Net sales $ 491 $ 396