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Note 14 - Segment Information - Total Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Jun. 27, 2020
Dec. 28, 2019
Jun. 29, 2019
Total assets $ 70,178 $ 96,173 $ 92,099
UNITED STATES      
Total assets 48,654 75,724  
CANADA      
Total assets 13,941 13,770  
PUERTO RICO      
Total assets 2,135 2,066  
SERBIA      
Total assets $ 5,448 $ 4,613