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Note 14 - Segment Data (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Oct. 01, 2017
USD ($)
Sep. 30, 2018
USD ($)
Oct. 01, 2017
USD ($)
Number of Operating Segments     2  
Revenue from Contract with Customer, Including Assessed Tax $ 21,101 $ 21,371 $ 64,014 $ 60,805
Intersegment Eliminations [Member]        
Revenue from Contract with Customer, Including Assessed Tax $ 0 $ 0 $ 0 $ 0