Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
SALES AND OPERATING REVENUES:
Coal sales		$ 79,036	$ 64,754	$ 179,515	$ 177,159
Other revenues		786	493	2,640	1,421
Total revenue		79,822	65,247	182,155	178,580
EXPENSES:
Operating expenses		67,792	46,570	144,257	131,204
Depreciation, depletion and amortization		9,842	9,315	29,864	30,159
Asset impairment		0	1,799	0	1,799
Asset retirement obligations accretion		380	348	1,116	1,024
Exploration costs		96	174	313	635
General and administrative		3,067	3,131	9,271	8,787
Total operating expenses		81,177	61,337	184,821	173,608
INCOME (LOSS) FROM OPERATIONS		(1,355)	3,910	(2,666)	4,972
Interest expense	[1]	(2,108)	(2,329)	(6,188)	(10,877)
Gain on extinguishment of debt		10,000	0	10,000	0
Equity method investment income (loss)		90	(119)	153	1,167
INCOME (LOSS) BEFORE INCOME TAXES		6,627	1,462	1,299	(4,738)
Current		0	(74)	0	(598)
Deferred		(1,359)	(387)	(2,691)	(2,657)
Total income tax benefit		(1,359)	(461)	(2,691)	(3,255)
NET INCOME (LOSS)		$ 7,986	$ 1,923	$ 3,990	$ (1,483)
NET INCOME (LOSS) PER SHARE:
Basic and diluted (in dollars per share)		$ 0.26	$ 0.06	$ 0.13	$ (0.05)
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic and diluted (in shares)		30,613	30,465	30,612	30,436
(1) Interest Expense:
Bank interest		$ 2,167	$ 2,714	$ 6,610	$ 8,210
Non-cash interest:
Change in interest rate swap valuation		(716)	(995)	(2,330)	981
Amortization of debt issuance costs		657	610	1,908	1,686
Total non-cash interest		(59)	(385)	(422)	2,667
Total interest	[1]	$ 2,108	$ 2,329	$ 6,188	$ 10,877

[1] Interest Expense