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INVESTMENTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Cost Method Investments	$ 4,400
Cost	20,140		$ 32,717
Gross Unrealized Gains	707	$ 320
Debt Securities, Trading, Unrealized Loss	(180)	(363)
Investments in trading securities	20,667		32,674
Cost	20,405		32,982
Gross Unrealized Gains	707	327
Debt Securities, Trading, and Equity Securities, Unrealized Loss	(204)	(394)
Estimated Fair Value	20,908		32,915
Long-term Investments	7,247		7,247
Long-term Investments Carried at Fair Value	241		241
Long-term Investments Carried at Fair Value using NAV	300
Equity Method Investments	$ 4,519	4,228	$ 4,284
Zarvona Energy Fund GP , L.P .
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Equity Method Investments	$ 3,800		$ 3,565
Zarvona Energy Fund II-A, L.P .
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Equity Method Investment, Ownership Percentage	0.50%		0.50%
Equity Method Investments	$ 700		$ 700
Salient MLP Total Return Fund, L.P. [Domain]
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Equity Method Investment, Ownership Percentage	0.00%		0.00%
Equity Method Investments	$ 11		$ 11
Salient MLP Total Return TE Fund, L.P.
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Equity Method Investment, Ownership Percentage	0.20%		0.20%
Equity Method Investments	$ 8		$ 8
Total
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Equity Method Investments	4,519		4,284
U.S. Government securities
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Cost	12,542		22,522
Gross Unrealized Gains	235	14
Debt Securities, Trading, Unrealized Loss	(47)	(75)
Investments in trading securities	12,730		22,461
Money market funds
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Cost	4,178		5,367
Gross Unrealized Gains	145	111
Debt Securities, Trading, Unrealized Loss	0	0
Investments in trading securities	4,323		5,478
Equity funds
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Cost	3,008		4,295
Gross Unrealized Gains	327	195
Debt Securities, Trading, Unrealized Loss	(104)	(260)
Investments in trading securities	3,231		4,230
Equity Securities
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Cost	263		381
Gross Unrealized Gains	0	0
Debt Securities, Trading, Unrealized Loss	(26)	(24)
Investments in trading securities	237		357
us-gaap_EquitySecuritiesMember [Member]
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Cost	149		152
Gross Unrealized Gains	0	0
Debt Securities, Trading, Unrealized Loss	(3)	(4)
Investments in trading securities	146		148
Private investment fund
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Cost	265		265
Gross Unrealized Gains	0	7
Equity Securities, FV-NI, Unrealized Loss	(24)	$ (31)
Estimated Fair Value	$ 241		$ 241

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