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Note 3 - Cash - Summary of Cash (Details) - USD ($)
$ in Thousands
Jul. 01, 2018
Dec. 31, 2017
Jul. 02, 2017
Dec. 31, 2016
Cash $ 20,285 $ 18,241    
Restricted Cash 464 89    
Total $ 20,749 $ 18,330 $ 14,933 $ 10,629