COMMITMENTS AND CONTINGENCIES - Maturity analysis of operating lease liabilities (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
COMMITMENTS AND CONTINGENCIES
Within one year	$ 120,000	$ 140,000
After one but within two years	68,000	86,000
After two but within three years	68,000	68,000
After three but within four years	68,000	68,000
After four but within five years	68,000	68,000
After five years	2,190,000	2,258,000
Total undiscounted cash flows	2,582,000	2,688,000
Discount on cash flows	(1,083,000)	(1,175,000)
Total lease liability	1,499,000	1,513,000
Finance Lease, Minimum Lease Payments due:
Within one year	10,000	19,000
After one but within two years	7,000	19,000
After two but within three years		15,000
After three but within four years		9,000
After four but within five years		9,000
After five years		16,000
Total undiscounted cash flows	17,000	87,000
Discount on cash flows	(1,000)	(3,000)
Total lease liability	$ 16,000	$ 84,000