INCOME TAXES - Net Deferred Tax Assets (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Investment in partnership	$ 88,054,000	$ 92,881,000
Asset retirement obligation	512,000	480,000
Net operating losses	44,437,000	37,675,000
Property, plant, and equipment	3,358,000	4,471,000
Total deferred tax assets	136,361,000	135,507,000
Valuation allowance	(135,263,000)	(133,077,000)
Net deferred tax assets	1,098,000	2,430,000
Deferred tax liabilities:
Other	1,098,000	2,430,000
Net deferred tax assets	$ 0	$ 0