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SHARE BASED COMPENSATION - Summary of Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Mar. 31, 2017
Selling, general and administrative expenses      
SHARE BASED COMPENSATION      
Share-based compensation expense $ 523 $ 494  
2006 Plan      
SHARE BASED COMPENSATION      
Number of shares authorized under the plan     3,000,000
Shares available to grant 0    
2012 Plan      
SHARE BASED COMPENSATION      
Number of shares authorized under the plan 1,700,000    
Shares available to grant 868,655