CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues
Lime and limestone operations	$ 30,155	$ 33,905
Natural gas interests	1,430	2,123
Total revenues	31,585	36,028
Cost of revenues:
Labor and other operating expenses	21,641	23,257
Depreciation, depletion and amortization	3,653	3,568
Total cost of revenues	25,294	26,825
Gross profit	6,291	9,203
Selling, general and administrative expenses	2,143	2,267
Operating profit	4,148	6,936
Other expense (income):
Interest expense	489	576
Other, net	(39)	26
Total other expense (income)	450	602
Income before income taxes	3,698	6,334
Income tax expense	941	1,710
Net income	$ 2,757	$ 4,624
Income per share of common stock:
Basic (in dollars per share)	$ 0.50	$ 0.75
Diluted (in dollars per share)	$ 0.50	$ 0.75