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STOCKHOLDERS' EQUITY - Stock Based Compensation - RSU activities (Details) - Restricted stock units - shares	1 Months Ended				12 Months Ended					48 Months Ended
	Aug. 31, 2023	Jun. 30, 2023	Aug. 31, 2022	Jun. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2022
STOCKHOLDERS' EQUITY
Number of shares granted					85,250	85,350	80,700
Number of shares vested					74,988	64,488	73,750
Number of shares forfeited					3,226	10,538
Number of shares outstanding					248,112	241,076	230,752	223,802		241,076
Performance cycle					3 years	3 years	3 years	3 years	3 years
Awards granted in 2023
STOCKHOLDERS' EQUITY
Number of shares granted					85,250
Number of shares outstanding					85,250
Awards granted in 2022
STOCKHOLDERS' EQUITY
Number of shares granted						85,350
Number of shares forfeited					2,110
Number of shares outstanding					83,240
Awards granted in 2021
STOCKHOLDERS' EQUITY
Number of shares granted							80,700
Number of shares forfeited					1,078
Number of shares outstanding					79,622
Awards granted in 2020
STOCKHOLDERS' EQUITY
Number of shares granted								75,026
Number of shares vested	74,988	74,988
Number of shares forfeited		38
Awards granted in 2019
STOCKHOLDERS' EQUITY
Number of shares granted									77,776
Number of shares vested			64,488
Number of shares forfeited				10,538					2,750	13,288

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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