CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues
Lime and limestone operations	$ 36,452	$ 37,855	$ 97,593	$ 110,226
Natural gas	577	1,218	1,950	4,214
Total revenues	37,029	39,073	99,543	114,440
Cost of revenues:
Labor and other operating expenses	22,695	25,461	64,563	74,590
Depreciation, depletion and amortization	3,967	3,729	11,736	10,952
Total cost of revenues	26,662	29,190	76,299	85,542
Gross profit	10,367	9,883	23,244	28,898
Selling, general and administrative expenses	2,467	2,404	7,266	7,004
Operating profit	7,900	7,479	15,978	21,894
Other expenses (income):
Interest expense	57	369	969	1,176
Other (income) expense, net	(54)	10	651	(43)
Total other expense (income)	3	379	1,620	1,133
Income before income taxes	7,897	7,100	14,358	20,761
Income tax expense	2,221	1,674	3,758	5,125
Net income	$ 5,676	$ 5,426	$ 10,600	$ 15,636
Income per share of common stock:
Basic (in dollars per share)	$ 1.01	$ 0.97	$ 1.89	$ 2.80
Diluted (in dollars per share)	1.01	0.97	1.89	2.80
Cash dividends per share of common stock (in dollars per share)	$ 0.125	$ 0.125	$ 0.375	$ 0.375