v3.21.1

STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Apr. 04, 2021 | Mar. 29, 2020 | Jun. 28, 2015
Stock-based compensation |  |  |
Stock-based compensation expense | $ 318 | $ 137 |
Stock Options |  |  |
Stock-based compensation |  |  |
Stock-based compensation expense | 89 | 81 |
Restricted Stock |  |  |
Stock-based compensation |  |  |
Stock-based compensation expense | $ 229 | $ 56 |
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 |  |  | 1,500,000
Shares available for grant | 184,476 |  |
2005 Plan |  |  |
Stock-based compensation |  |  |
Shares available for grant | 0 |  |

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