Summary of Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Quarterly Financial Data (unaudited)

Summary of unaudited quarterly financial data

	2012
	March 31,		June 30,		September 30,		December 31,
Revenues
Lime and limestone operations	$	33,905	$	34,729	$	32,558	$	30,212
Natural gas interests		2,123		1,769		1,558		1,671
	$	36,028	$	36,498	$	34,116	$	31,883
Gross profit
Lime and limestone operations	$	7,951	$	7,324	$	6,972	$	7,252
Natural gas interests		1,252		1,029		787		871
	$	9,203	$	8,353	$	7,759	$	8,123
Net income	$	4,624	$	4,060	$	3,947	$	3,792
Basic income per common share	$	0.75	$	0.73	$	0.71	$	0.68
Diluted income per common share	$	0.75	$	0.73	$	0.71	$	0.68

	2011
	March 31,		June 30,		September 30,		December 31,
Revenues
Lime and limestone operations	$	30,202	$	33,382	$	35,658	$	30,462
Natural gas interests		2,864		3,458		3,524		3,032
	$	33,066	$	36,840	$	39,182	$	33,494
Gross profit
Lime and limestone operations	$	7,539	$	7,814	$	10,092	$	6,696
Natural gas interests		1,873		2,585		2,447		2,302
	$	9,412	$	10,399	$	12,539	$	8,998
Net income	$	4,813	$	5,795	$	7,062	$	4,515
Basic income per common share	$	0.75	$	0.90	$	1.12	$	0.73
Diluted income per common share	$	0.75	$	0.90	$	1.11	$	0.72