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Summary of Quarterly Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
Summary of Quarterly Financial Data (unaudited)  
Summary of unaudited quarterly financial data

 

 

 
   2013  
 
   March 31,   June 30,   September 30,   December 31,  

Revenues

                          

Lime and limestone operations

   $ 30,155   $ 33,684   $ 35,498   $ 28,666  

Natural gas interests

     1,430     1,488     1,401     1,443  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ 31,585   $ 35,172   $ 36,899   $ 30,109  

Gross profit

                          

Lime and limestone operations

   $ 5,667   $ 8,363   $ 8,409   $ 5,474  

Natural gas interests

     624     601     701     961  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ 6,291   $ 8,964   $ 9,110   $ 6,435  

Net income

   $ 2,757   $ 4,626   $ 4,789   $ 2,629  

Basic income per common share

   $ 0.50   $ 0.83   $ 0.86   $ 0.47  

Diluted income per common share

   $ 0.50   $ 0.83   $ 0.86   $ 0.47  


 

 
   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