CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues
Lime and limestone operations	$ 37,855	$ 35,498	$ 110,226	$ 99,337
Natural gas interests	1,218	1,401	4,214	4,319
Total revenues	39,073	36,899	114,440	103,656
Cost of revenues:
Labor and other operating expenses	25,461	24,200	74,590	68,450
Depreciation, depletion and amortization	3,729	3,589	10,952	10,841
Total cost of revenues	29,190	27,789	85,542	79,291
Gross profit	9,883	9,110	28,898	24,365
Selling, general and administrative expenses	2,404	2,223	7,004	6,665
Operating profit	7,479	6,887	21,894	17,700
Other expense (income):
Interest expense	369	451	1,176	1,405
Other, net	10	59	(43)	(15)
Total other expense (income)	379	510	1,133	1,390
Income before income taxes	7,100	6,377	20,761	16,310
Income tax expense	1,674	1,588	5,125	4,139
Net income	$ 5,426	$ 4,789	$ 15,636	$ 12,171
Net income per share of common stock:
Basic (in dollars per share)	$ 0.97	$ 0.86	$ 2.80	$ 2.19
Diluted (in dollars per share)	$ 0.97	$ 0.86	$ 2.80	$ 2.19
Cash dividend per share of common stock (in dollars per share)	$ 0.125		$ 0.375