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CASH FLOW INFORMATION - Stock-Based Compensation (Details) - 2015 EIP Plan - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Feb. 23, 2021 | Feb. 25, 2020 | Mar. 31, 2021
Restricted Stock Units |  |  |
Non-cash investing and financing activities |  |  |
Granted (in shares) | 103,599 | 173,749 | 103,870
Aggregate fair value | $ 1,027 | $ 1,227 |
Stock Options |  |  |
Non-cash investing and financing activities |  |  |
Options to purchase (in shares) | 118,552 | 344,568 | 118,552
Exercise price | $ 9.91 | $ 7.06 | $ 9.91
Aggregate fair value | $ 513 | $ 693 |

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