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Business Segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
segment
Sep. 30, 2012
Business Segments        
Number of business segments     2  
Business segments        
Revenues $ 36,899 $ 34,116 $ 103,656 $ 106,642
Depreciation, depletion and amortization 3,589 3,737 10,841 11,006
Gross profit 9,110 7,759 24,365 25,315
Capital expenditures 2,678 1,729 6,690 6,489
Lime and limestone operations
       
Business segments        
Revenues 35,498 32,558 99,337 101,192
Depreciation, depletion and amortization 3,334 3,457 10,048 10,121
Gross profit 8,409 6,972 22,439 22,247
Capital expenditures 2,657 1,693 6,636 6,425
Natural gas interests
       
Business segments        
Revenues 1,401 1,558 4,319 5,450
Depreciation, depletion and amortization 255 280 793 885
Gross profit 701 787 1,926 3,068
Capital expenditures $ 21 $ 36 $ 54 $ 64