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Note 13 - Segment Data (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 01, 2018
USD ($)
Apr. 02, 2017
USD ($)
Dec. 31, 2018
Number of Operating Segments 2   2
Revenue from Contract with Customer, Including Assessed Tax $ 19,942 $ 18,185  
Intersegment Eliminations [Member]      
Revenue from Contract with Customer, Including Assessed Tax $ 0 $ 0