CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues
Lime and limestone operations	$ 35,051	$ 30,155
Natural gas interests	1,640	1,430
Total revenues	36,691	31,585
Cost of revenues:
Labor and other operating expenses	24,543	21,641
Depreciation, depletion and amortization	3,556	3,653
Total cost of revenues	28,099	25,294
Gross profit	8,592	6,291
Selling, general and administrative expenses	2,182	2,143
Operating profit	6,410	4,148
Other expense (income):
Interest expense	399	489
Other, net	2	(39)
Total other expense (income)	401	450
Income before income taxes	6,009	3,698
Income tax expense	1,517	941
Net income	$ 4,492	$ 2,757
Income per share of common stock:
Basic (in dollars per share)	$ 0.81	$ 0.50
Diluted (in dollars per share)	$ 0.80	$ 0.50
Cash dividend per share of common stock (in dollars per share)	$ 0.125