CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues
Lime and limestone operations	$ 35,517	$ 33,154
Natural gas interests	636	432
Total revenues	36,153	33,586
Cost of revenues:
Labor and other operating expenses	23,679	21,829
Depreciation, depletion and amortization	4,236	3,909
Total cost of revenues	27,915	25,738
Gross profit	8,238	7,848
Selling, general and administrative expenses	2,420	2,400
Operating profit	5,818	5,448
Other expenses (income):
Interest expense	59	59
Other income, net	(179)	(43)
Total other expense (income)	(120)	16
Income before income taxes	5,938	5,432
Income tax expense	1,318	1,366
Net income	$ 4,620	$ 4,066
Net income per share of common stock:
Basic (in dollars per share)	$ 0.83	$ 0.73
Diluted (in dollars per share)	0.83	0.73
Cash dividends per share of common stock (in dollars per share)	$ 0.135	$ 0.125