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Note 13 - Segment Data (Details Textual)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Apr. 01, 2018
USD ($)
Number of Operating Segments 2  
Revenue from Contract with Customer, Including Assessed Tax $ 19,564 $ 19,942
Intersegment Eliminations [Member]    
Revenue from Contract with Customer, Including Assessed Tax $ 0