Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
SALES AND OPERATING REVENUES:
Other revenues		$ 945	$ 1,522	$ 3,888	$ 5,187
Total revenue		165,768	85,084	515,296	209,920
EXPENSES:
Operating expenses		119,042	64,557	367,983	170,552
Depreciation, depletion and amortization		16,230	11,187	51,375	31,882
Asset retirement obligations accretion		468	255	1,380	751
Exploration costs		171	121	682	393
General and administrative		6,054	3,569	18,596	10,440
Total operating expenses		141,965	79,689	440,016	214,018
INCOME (LOSS) FROM OPERATIONS		23,803	5,395	75,280	(4,098)
Interest expense (1)	[1]	(3,030)	(3,355)	(10,470)	(7,476)
Loss on extinguishment of debt		(1,491)	0	(1,491)	0
Equity method investment (loss) income		(177)	168	(325)	506
NET INCOME (LOSS) BEFORE INCOME TAXES		19,105	2,208	62,994	(11,068)
INCOME TAX EXPENSE (BENEFIT):
Current		(178)	0	315	0
Deferred		3,208	596	7,638	840
Total income tax expense		3,030	596	7,953	840
NET INCOME (LOSS)		$ 16,075	$ 1,612	$ 55,041	$ (11,908)
NET INCOME (LOSS) PER SHARE:
Basic (in dollars per share)		$ 0.49	$ 0.05	$ 1.66	$ (0.38)
Diluted (in dollars per share)		$ 0.44	$ 0.05	$ 1.52	$ (0.38)
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)		33,140	32,983	33,088	31,727
Diluted (in shares)		36,848	33,268	36,748	31,727
(1) Interest Expense:
Interest on bank debt		$ 2,006	$ 2,133	$ 6,316	$ 5,555
Other interest		422	227	1,316	285
Amortization and swap-related interest:
Payments on interest rate swap, net of changes in value		0	0	0	(867)
Amortization of debt issuance costs		602	995	2,838	2,503
Total amortization and swap related interest		602	995	2,838	1,636
Total interest expense	[1]	3,030	3,355	10,470	7,476
Coal Sales [Member]
SALES AND OPERATING REVENUES:
Revenues		97,420	83,562	280,596	204,733
Electric Sales [Member]
SALES AND OPERATING REVENUES:
Revenues		$ 67,403		$ 230,812	$ 0

[1] Interest Expense: