Condensed Consolidated Statements of Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
REVENUE:
Coal sales		$ 50,473	$ 71,113	$ 112,405	$ 156,348
Other operating income (Note 8)		1,608	1,197	2,214	5,275
Total revenue		52,081	72,310	114,619	161,623
COSTS AND EXPENSES:
Operating costs and expenses		36,165	54,001	84,634	116,420
DD&A		10,217	12,096	20,844	23,834
ARO accretion		343	314	676	623
Exploration costs		208	208	461	488
SG&A		2,678	3,475	5,656	6,459
Interest (1)	[1]	2,834	5,369	8,548	9,988
Total costs and expenses		52,445	75,463	120,819	157,812
INCOME (LOSS) BEFORE INCOME TAXES		(364)	(3,153)	(6,200)	3,811
INCOME TAX EXPENSE (BENEFIT) (NOTE 9):
Current		0	78	(524)	(151)
Deferred		(618)	113	(2,270)	306
Total income tax expense (benefit)		(618)	191	(2,794)	155
NET INCOME (LOSS)		$ 254	$ (3,344)	$ (3,406)	$ 3,656
NET INCOME (LOSS) PER SHARE (NOTE 13):
Basic and diluted (in dollars per share)		$ 0.01	$ (0.11)	$ (0.11)	$ 0.12
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic and diluted (in shares)		30,423	30,245	30,421	30,245
(1) Bank interest		$ 2,842	$ 2,933	$ 5,496	$ 5,945
Change in interest rate swap valuation		(617)	1,843	1,976	2,856
Amortization of debt issuance costs		609	542	1,076	1,085
Other		0	51	0	102
Total non-cash interest		(8)	2,436	3,052	4,043
Total interest	[1]	$ 2,834	$ 5,369	$ 8,548	$ 9,988

[1] (1) Bank interest 2,654 3,012 2,654 3,012 Non-cash interest: Change in interest rate swap valuation 2,593 1,013 2,593 1,013 Amortization of debt issuance costs 467 543 467 543 Other — 51 — 51 Total non-cash interest 3,060 1,607 3,060 1,607 Total interest $ 5,714 $ 4,619 $ 5,714 $ 4,619