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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Net sales $ 49,394 $ 47,808 $ 148,120 $ 139,758
Product [Member]        
Net sales 47,400 46,423 144,386 135,670
Tooling and Machinery [Member]        
Net sales 952 537 1,920 2,135
Engineering and Development [Member]        
Net sales $ 1,042 $ 848 $ 1,814 $ 1,953