Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues
Lime and limestone operations	$ 128,003	$ 131,404	$ 129,704
Natural gas interests	5,762	7,121	12,878
Total revenues	133,765	138,525	142,582
Labor and other operating expenses
Lime and limestone operations	86,754	88,346	85,367
Natural gas interests	1,920	1,891	2,269
Depreciation, depletion and amortization	14,291	14,850	13,597
Total cost of revenues	102,965	105,087	101,233
Gross profit	30,800	33,438	41,349
Selling, general and administrative expenses, including depreciation and amortization expense of $207, $194 and $184 in 2013, 2012 and 2011, respectively	9,149	9,193	8,846
Operating profit	21,651	24,245	32,503
Other expense (income):
Interest expense	1,852	2,163	2,495
Other, net	(34)	(19)	(136)
Total other expense (income)	1,818	2,144	2,359
Income before income taxes	19,833	22,101	30,144
Income tax expense	5,033	5,678	7,958
Net income	$ 14,800	$ 16,423	$ 22,186
Net income per share of common stock:
Basic (in dollars per share)	$ 2.66	$ 2.88	$ 3.50
Diluted (in dollars per share)	$ 2.66	$ 2.87	$ 3.49