STOCKHOLDERS' EQUITY - Common stock (Details) - $ / shares	Dec. 31, 2023	Dec. 31, 2022
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	29,937,159
Common stock in treasury - at cost, shares	4,087,145	4,087,145
Common shares reserved for future issuance	377,595