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Note 14 - Segment Data (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2017
USD ($)
Oct. 02, 2016
USD ($)
Oct. 01, 2017
USD ($)
Oct. 02, 2016
USD ($)
Number of Operating Segments     2  
Revenues $ 21,371 $ 21,384 $ 60,805 $ 71,826
Intersegment Eliminations [Member]        
Revenues $ 0 $ 0 $ 0 $ 0