v3.21.2
STOCK-BASED COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 03, 2021
Sep. 27, 2020
Oct. 03, 2021
Sep. 27, 2020
Jun. 28, 2015
Stock-based compensation          
Stock-based compensation expense $ 294 $ 174 $ 932 $ 422  
Stock Options          
Stock-based compensation          
Stock-based compensation expense 62 110 245 235  
Restricted Stock          
Stock-based compensation          
Stock-based compensation expense $ 232 $ 64 $ 687 $ 187  
Employees and Directors | Stock Options          
Stock-based compensation          
Expiration period     10 years    
Employees and Directors | Minimum | Stock Options          
Stock-based compensation          
Vesting period     2 years    
Employees and Directors | Maximum | Stock Options          
Stock-based compensation          
Vesting period     5 years    
2015 Plan          
Stock-based compensation          
Shares authorized for issuance         2,000,000
Shares available for grant 723,690   723,690    
2005 Plan          
Stock-based compensation          
Shares available for grant 0   0