v3.21.2
STOCK-BASED COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 04, 2021
Jun. 28, 2020
Jul. 04, 2021
Jun. 28, 2020
Jun. 28, 2015
Stock-based compensation          
Stock-based compensation expense $ 320 $ 111 $ 638 $ 248  
Stock Options          
Stock-based compensation          
Stock-based compensation expense 94 44 183 125  
Restricted Stock          
Stock-based compensation          
Stock-based compensation expense $ 226 $ 67 $ 455 $ 123  
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 685,324   685,324    
2005 Plan          
Stock-based compensation          
Shares available for grant 0   0