Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
SALES AND OPERATING REVENUES:
Coal sales		$ 54,600	$ 50,473	$ 100,479	$ 112,405
Other revenues		1,038	377	1,854	928
Total revenue		55,638	50,850	102,333	113,333
EXPENSES:
Operating expenses		42,456	36,165	76,465	84,634
Depreciation, depletion and amortization		9,715	10,217	20,022	20,844
Asset retirement obligations accretion		373	343	736	676
Exploration costs		159	208	217	461
General and administrative		3,383	2,678	6,204	5,656
Total operating expenses		56,086	49,611	103,644	112,271
INCOME (LOSS) FROM OPERATIONS		(448)	1,239	(1,311)	1,062
Interest expense	[1]	(2,182)	(2,834)	(4,080)	(8,548)
Equity method investment income		63	1,231	63	1,286
LOSS BEFORE INCOME TAXES		(2,567)	(364)	(5,328)	(6,200)
Current		0	0	0	(524)
Deferred		397	(618)	(1,332)	(2,270)
Total income tax expense (benefit)		397	(618)	(1,332)	(2,794)
NET INCOME (LOSS)		$ (2,964)	$ 254	$ (3,996)	$ (3,406)
NET INCOME (LOSS) PER SHARE:
Basic and diluted (in dollars per share)		$ (0.10)	$ 0.01	$ (0.13)	$ (0.11)
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic and diluted (in shares)		30,613	30,423	30,612	30,421
(1) Interest Expense:
Bank interest		$ 2,307	$ 2,842	$ 4,443	$ 5,496
Non-cash interest:
Change in interest rate swap valuation		(766)	(617)	(1,614)	1,976
Amortization of debt issuance costs		641	609	1,251	1,076
Total non-cash interest		(125)	(8)	(363)	3,052
Total interest	[1]	$ 2,182	$ 2,834	$ 4,080	$ 8,548

[1] Bank interest