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Note 11 - Segment Data (Details Textual)
$ in Thousands
3 Months Ended
Apr. 05, 2020
USD ($)
Mar. 31, 2019
USD ($)
Number of Operating Segments 2  
Revenue from Contract with Customer, Including Assessed Tax $ 22,425 $ 19,564
Intersegment Eliminations [Member]    
Revenue from Contract with Customer, Including Assessed Tax $ 0 $ 0