CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues
Lime and limestone operations	$ 35,965	$ 32,376	$ 71,482	$ 65,530
Natural gas interests	553	504	1,189	936
Total revenues	36,518	32,880	72,671	66,466
Cost of revenues
Labor and other operating expenses	23,626	21,710	47,305	43,539
Depreciation, depletion and amortization	4,054	3,929	8,290	7,838
Total cost of revenues	27,680	25,639	55,595	51,377
Gross profit	8,838	7,241	17,076	15,089
Selling, general and administrative expenses	2,518	2,331	4,938	4,731
Operating profit	6,320	4,910	12,138	10,358
Other expenses (income)
Interest expense	59	63	118	122
Other income, net	(225)	(80)	(404)	(123)
Total other expense (income)	(166)	(17)	(286)	(1)
Income before income taxes	6,486	4,927	12,424	10,359
Income tax expense	1,208	1,240	2,526	2,606
Net income	$ 5,278	$ 3,687	$ 9,898	$ 7,753
Net income per share of common stock
Basic (in dollars per share)	$ 0.95	$ 0.66	$ 1.77	$ 1.39
Diluted (in dollars per share)	0.94	0.66	1.77	1.39
Cash dividends per share of common stock (in dollars per share)	$ 0.135	$ 0.125	$ 0.270	$ 0.250