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Note 13 - Segment Data (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 05, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jul. 05, 2020
USD ($)
Jun. 30, 2019
USD ($)
Number of Operating Segments     2  
Revenue from Contract with Customer, Including Assessed Tax $ 17,153 $ 24,444 $ 39,578 $ 44,008
Intersegment Eliminations [Member]        
Revenue from Contract with Customer, Including Assessed Tax $ 0 $ 0 $ 0 $ 0