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Note 2 - Revenue Recognition - Revenue Disaggregated by the Major Types of Goods and Services Sold (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Net sales $ 47,328 $ 42,931
Product [Member]    
Net sales 46,410 42,226
Tooling and Machinery [Member]    
Net sales 645 410
Engineering and Development [Member]    
Net sales $ 273 $ 295