Consolidated Statement of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Revenue:
Coal sales		$ 75,795	$ 97,073
Other		490	752
Revenue		75,885	98,001
Costs and expenses:
Operating costs and expenses		49,777	66,152
DD&A		9,182	11,338
Coal exploration costs		419	708
SG&A		2,762	3,344
Interest	[1]	5,845	5,456
Costs and expenses		67,985	86,998
Income before income taxes		7,900	11,003
Less income taxes:
Current		768	1,416
Deferred		970	1,996
Income taxes		1,738	3,412
Net income		$ 6,162	$ 7,591
Net income per share: (Note 7)
Basic and diluted (in Dollars per share)		$ 0.21	$ 0.25
Weighted average shares outstanding:
Basic and diluted (in Shares)		29,251	28,962
Net change in the estimated fair value of interest rate swap		$ 1,500		$ 1,300
Savoy [Member]
Revenue:
Equity income (loss)		(325)	$ 136
Revenue		2,148	4,360
Costs and expenses:
Costs and expenses		2,943	4,027
Less income taxes:
Net income		(795)	333
Sunrise Energy [Member]
Revenue:
Equity income (loss)		(75)	40
Revenue		458	617
Costs and expenses:
Costs and expenses		607	537
Less income taxes:
Net income		$ (149)	$ 80

[1] Interest expense for 2016 and 2015 includes $1.5 and $1.3 million, respectively for the net change in the estimated fair value of our interest rate swaps