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Note 14 - Segment Data (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2018
USD ($)
Jul. 02, 2017
USD ($)
Jul. 01, 2018
USD ($)
Jul. 02, 2017
USD ($)
Number of Operating Segments     2  
Revenue from Contract with Customer, Including Assessed Tax $ 22,971 $ 21,249 $ 42,913 $ 39,434
Intersegment Eliminations [Member]        
Revenue from Contract with Customer, Including Assessed Tax $ 0 $ 0 $ 0 $ 0