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Note 13 - Segment Data (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 29, 2019
USD ($)
Sep. 30, 2018
USD ($)
Number of Operating Segments     2  
Revenue from Contract with Customer, Including Assessed Tax $ 22,259 $ 21,101 $ 66,267 $ 64,014
Intersegment Eliminations [Member]        
Revenue from Contract with Customer, Including Assessed Tax     $ 0