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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, 2021
Mar. 31, 2020
Net sales $ 48,599 $ 48,277
Product [Member]    
Net sales 47,323 47,029
Tooling and Machinery [Member]    
Net sales 412 677
Engineering and Development [Member]    
Net sales $ 864 $ 571