Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues
Lime and limestone operations	$ 129,704	$ 125,169	$ 110,406
Natural gas interests	12,878	7,425	6,925
Total revenues	142,582	132,594	117,331
Labor and other operating expenses
Lime and limestone operations	85,367	81,825	73,982
Natural gas interests	2,269	1,421	1,514
Depreciation, depletion and amortization	13,597	13,307	13,082
Total cost of revenues	101,233	96,553	88,578
Gross profit	41,349	36,041	28,753
Selling, general and administrative expenses, including depreciation and amortization expense of $184, $304 and $393 in 2011, 2010 and 2009, respectively	8,846	8,376	7,798
Operating profit	32,503	27,665	20,955
Other expense (income):
Interest expense	2,495	2,715	2,886
Other, net	(136)	(108)	(75)
Total other expense (income)	2,359	2,607	2,811
Income before income taxes	30,144	25,058	18,144
Income tax expense	7,958	7,018	4,474
Net income	$ 22,186	$ 18,040	$ 13,670
Net income per share of common stock:
Basic (in dollars per share)	$ 3.50	$ 2.82	$ 2.14
Diluted (in dollars per share)	$ 3.49	$ 2.81	$ 2.14