CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues
Lime and limestone operations	$ 33,684	$ 34,729	$ 63,839	$ 68,634
Natural gas interests	1,488	1,769	2,918	3,892
Total revenues	35,172	36,498	66,757	72,526
Cost of revenues:
Labor and other operating expenses	22,609	24,444	44,250	47,701
Depreciation, depletion and amortization	3,599	3,701	7,252	7,269
Total cost of revenues	26,208	28,145	51,502	54,970
Gross profit	8,964	8,353	15,255	17,556
Selling, general and administrative expenses	2,299	2,327	4,442	4,594
Operating profit	6,665	6,026	10,813	12,962
Other expense (income):
Interest expense	465	542	954	1,118
Other, net	(36)	(77)	(74)	(51)
Total other expense (income)	429	465	880	1,067
Income before income taxes	6,236	5,561	9,933	11,895
Income tax expense	1,610	1,501	2,551	3,211
Net income	$ 4,626	$ 4,060	$ 7,382	$ 8,684
Income per share of common stock:
Basic (in dollars per share)	$ 0.83	$ 0.73	$ 1.33	$ 1.48
Diluted (in dollars per share)	$ 0.83	$ 0.73	$ 1.33	$ 1.48