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Note 13 - Segment Data (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jul. 01, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jul. 01, 2018
USD ($)
Number of Operating Segments     2  
Revenue from Contract with Customer, Including Assessed Tax $ 24,444 $ 22,971 $ 44,008 $ 42,913
Intersegment Eliminations [Member]        
Revenue from Contract with Customer, Including Assessed Tax     $ 0