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STOCK-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2020
STOCK-BASED COMPENSATION PLANS |
Schedule of stock options, activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2018
​ |  | ​ |  | Weighted
​ | ​ | Shares | ​ | Average
​ | ​ | Under | ​ | Exercise
​ | ​ | Option | ​ | Price
Outstanding at Beginning of Period |  | 11 | ​ | $ | 5.49
Granted |  | — | ​ |  | —
Exercised |  | (10) | ​ |  | 5.49
Forfeited and cancelled |  | (1) | ​ |  | 5
Outstanding at End of Period |  | — | ​ | $ | —
Options exercisable at year end |  | — | ​ | $ | —

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