COMMITMENTS AND CONTINGENCIES - Maturity analysis of operating lease liabilities (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
COMMITMENTS AND CONTINGENCIES
Within one year	$ 166,000	$ 175,000
After one but within two years	140,000	140,000
After two but within three years	143,000	140,000
After three but within four years	155,000	154,000
After four but within five years	157,000	157,000
After five years	2,278,000	2,317,000
Total undiscounted cash flows	3,039,000	3,083,000
Discount on cash flows	(1,052,000)	(1,107,000)
Total lease liability	$ 1,987,000	$ 1,976,000