Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
SALES AND OPERATING REVENUES:
Other revenues	$ 1,667	$ 945	$ 4,221	$ 3,888
Total sales and operating revenues	105,044	165,768	310,175	515,296
EXPENSES:
Fuel	13,176	11,345	31,674	99,959
Other operating and maintenance costs	33,320	65,551	106,714	139,979
Cost of purchased power	3,149		7,694
Utilities	3,185	4,507	10,955	13,347
Labor	26,721	37,639	88,444	114,698
Depreciation, depletion, and amortization	13,838	16,230	42,930	51,375
Asset retirement obligations accretion	410	468	1,208	1,380
Exploration costs	62	171	179	682
General and administrative	6,471	6,054	20,218	18,596
Total operating expenses	100,332	141,965	310,016	440,016
INCOME FROM OPERATIONS	4,712	23,803	159	75,280
Interest expense (1)	(2,692)	(3,030)	(10,364)	(10,470)
Loss on extinguishment of debt		(1,491)	(2,790)	(1,491)
Equity method investment (loss)	(234)	(177)	(740)	(325)
NET INCOME (LOSS) BEFORE INCOME TAXES	1,786	19,105	(13,735)	62,994
INCOME TAX EXPENSE (BENEFIT):
Current		(178)		315
Deferred	232	3,208	(3,389)	7,638
Total income tax expense (benefit)	232	3,030	(3,389)	7,953
NET INCOME (LOSS)	$ 1,554	$ 16,075	$ (10,346)	$ 55,041
NET INCOME (LOSS) PER SHARE:
Basic (in dollar per share)	$ 0.04	$ 0.49	$ (0.27)	$ 1.66
Diluted (in dollar per share)	$ 0.04	$ 0.44	$ (0.27)	$ 1.52
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	42,598	33,140	38,455	33,088
Diluted (in shares)	43,018	36,848	38,455	36,748
Interest Expense:
Interest on bank debt	$ 2,073	$ 2,006	$ 7,657	$ 6,316
Other interest	181	422	1,456	1,316
Amortization:
Amortization of debt issuance costs	438	602	1,251	2,838
Total amortization	438	602	1,251	2,838
Total interest expense	2,692	3,030	10,364	10,470
Electric sales
SALES AND OPERATING REVENUES:
Revenues	71,715	67,403	191,861	230,812
Coal sales
SALES AND OPERATING REVENUES:
Revenues	$ 31,662	$ 97,420	$ 114,093	$ 280,596