Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
SALES AND OPERATING REVENUES:
Coal sales		$ 64,161	$ 54,600	$ 121,171	$ 100,479
Other revenues		1,768	1,038	3,665	1,854
Total revenue		65,929	55,638	124,836	102,333
EXPENSES:
Operating expenses		51,394	42,456	105,995	76,465
Depreciation, depletion and amortization		11,164	9,715	20,695	20,022
Asset retirement obligations accretion		250	373	496	736
Exploration costs		215	159	272	217
General and administrative		3,722	3,383	6,871	6,204
Total operating expenses		66,745	56,086	134,329	103,644
LOSS FROM OPERATIONS		(816)	(448)	(9,493)	(1,311)
Interest expense (1)	[1]	(2,337)	(2,182)	(4,121)	(4,080)
Equity method investment income		188	63	338	63
LOSS BEFORE INCOME TAXES		(2,965)	(2,567)	(13,276)	(5,328)
Current		0	0	0	0
Deferred		421	397	244	(1,332)
Total income tax expense (benefit)		421	397	244	(1,332)
NET LOSS		$ (3,386)	$ (2,964)	$ (13,520)	$ (3,996)
NET LOSS PER SHARE:
Basic and diluted (in dollars per share)		$ (0.11)	$ (0.10)	$ (0.44)	$ (0.13)
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic and diluted (in shares)		30,809	30,613	30,797	30,612
(1) Interest Expense:
Bank interest		$ 1,712	$ 2,307	$ 3,422	$ 4,443
Other interest		58	0	58	0
Non-cash interest:
Change in interest rate swap valuation		(250)	(766)	(867)	(1,614)
Amortization of debt issuance costs		817	641	1,508	1,251
Total non-cash interest		567	(125)	641	(363)
Total interest expense	[1]	$ 2,337	$ 2,182	$ 4,121	$ 4,080

[1] Bank interest