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STOCKHOLDERS' EQUITY - Common stock (Details) - $ / shares | Dec. 31, 2022 | Dec. 31, 2021
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STOCKHOLDERS' EQUITY |  |
Common stock, authorized shares | 100,000,000 | 100,000,000
Common stock no par value (in dollars per share) | $ 0 | $ 0
Common stock, outstanding shares | 29,937,159 | 33,484,935
Common stock in treasury - at cost, shares | 4,087,145 | 528,169
Common shares reserved for future issuance | 379,595 |

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