Condensed Consolidated Statements of Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
REVENUE:
Coal sales		$ 64,754	$ 82,883	$ 177,159	$ 239,231
Other operating income (Note 8)		374	213	2,588	5,488
Total revenue		65,128	83,096	179,747	244,719
COSTS AND EXPENSES:
Operating costs and expenses		46,570	71,363	131,204	187,783
Depreciation, depletion and amortization		9,315	11,778	30,159	35,612
Asset retirement obligations accretion		348	320	1,024	943
Exploration costs		174	347	635	835
Selling, general and administrative		3,131	2,926	8,787	9,385
Interest (1)	[1]	2,329	3,558	10,877	13,546
Asset impairment		1,799	0	1,799	0
Total costs and expenses		63,666	90,292	184,485	248,104
INCOME (LOSS) BEFORE INCOME TAXES		1,462	(7,196)	(4,738)	(3,385)
Current		(74)	(426)	(598)	(577)
Deferred		(387)	(3,047)	(2,657)	(2,741)
Total income tax benefit		(461)	(3,473)	(3,255)	(3,318)
NET INCOME (LOSS)		$ 1,923	$ (3,723)	$ (1,483)	$ (67)
INCOME (LOSS) PER SHARE (NOTE 13):
Basic and diluted (in dollars per share)		$ 0.06	$ (0.12)	$ (0.05)	$ (0.00)
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic and diluted (in shares)		30,465	30,249	30,436	30,246
(1) Bank interest		$ 2,709	$ 2,801	$ 8,201	$ 8,746
Change in fair value of interest rate swaps valuation		(995)	162	981	3,018
Amortization of debt issuance costs		610	543	1,686	1,628
Other		5	52	9	154
Total non-cash interest		(380)	757	2,676	4,800
Total interest	[1]	$ 2,329	$ 3,558	$ 10,877	$ 13,546

[1] Bank interest