CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues
Lime and limestone operations	$ 32,376	$ 31,779	$ 65,530	$ 61,141
Natural gas interests	504	671	936	1,373
Total revenues	32,880	32,450	66,466	62,514
Cost of revenues:
Labor and other operating expenses	21,710	21,552	43,539	41,868
Depreciation, depletion and amortization	3,929	3,885	7,838	7,769
Total cost of revenues	25,639	25,437	51,377	49,637
Gross profit	7,241	7,013	15,089	12,877
Selling, general and administrative expenses	2,331	2,400	4,731	4,799
Operating profit	4,910	4,613	10,358	8,078
Other expenses (income):
Interest expense	63	590	122	912
Other (income) expense, net	(80)	712	(123)	705
Total other expense (income)	(17)	1,302	(1)	1,617
Income before income taxes	4,927	3,311	10,359	6,461
Income tax expense	1,240	752	2,606	1,537
Net income	$ 3,687	$ 2,559	$ 7,753	$ 4,924
Income per share of common stock:
Basic (in dollars per share)	$ 0.66	$ 0.46	$ 1.39	$ 0.88
Diluted (in dollars per share)	0.66	0.46	1.39	0.88
Cash dividends per share of common stock (in dollars per share)	$ 0.125	$ 0.125	$ 0.25	$ 0.25