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STOCKHOLDERS' EQUITY - Stock Based Compensation - RSU activities (Details) - RSUs - shares	1 Months Ended				12 Months Ended
	Aug. 31, 2024	Jun. 30, 2024	Aug. 31, 2023	Jun. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
STOCKHOLDERS' EQUITY
Number of shares granted					88,250	85,250	85,350
Number of shares vested					39,811	74,988	64,488
Number of shares forfeited					39,811	3,226	10,538
Number of shares outstanding					256,740	248,112	241,076	230,752
Performance cycle					3 years	3 years	3 years	3 years	3 years
Awards granted in 2024
STOCKHOLDERS' EQUITY
Number of shares granted					88,250
Number of shares outstanding					88,250
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	2,110
Number of shares outstanding					83,240
Awards granted in 2021
STOCKHOLDERS' EQUITY
Number of shares granted								80,700
Number of shares vested	39,811
Number of shares forfeited		40,889				1,078
Number of shares forfeited due to applicable market condition not satisfied		39,811
Number of shares forfeited due to retirement of executive officer before completion of applicable performance cycle		1,078
Performance cycle		3 years
Awards granted in 2020
STOCKHOLDERS' EQUITY
Number of shares granted									75,026
Number of shares vested			74,988
Number of shares forfeited				38

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period due to service condition not met.

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