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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Summary of Significant Accounting Policies  
Schedule of supplemental cash flow information

 
   Years Ended December 31,  
 
   2013   2012   2011  

Cash paid during the year for:

                    

Interest

   $ 1,746   $ 2,069   $ 2,395  
               
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Income taxes

   $ 3,750   $ 3,000   $ 4,529  
               
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Schedule of the entity's financial liabilities measured at fair value on a recurring basis

 
   Fair Value Measurements as of December 31,    
 
    
    
   Significant Other
Observable Inputs
(Level 2)		    
 
   2013   2012   2013   2012   Valuation Technique

Interest rate swap liabilities

   $ (1,533 ) $ (2,629 ) $ (1,533 ) $ (2,629 ) Cash flows approach
                     
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Schedule of additions and write-offs to the Company's allowance for doubtful accounts

 
   2013   2012  

Beginning balance

   $ 525   $ 429  

Additions

     69     105  

Write-offs

     (356 )   (9 )
           
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Ending balance

   $ 238   $ 525  
           
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Schedule of inventories

 
   December 31,  
 
   2013   2012  

Lime and limestone inventories:

              

Raw materials

   $ 6,203   $ 6,718  

Finished goods

     2,284     2,328  
           
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   $ 8,487   $ 9,046  

Service parts inventories

     5,201     5,081  
           
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   $ 13,688   $ 14,127  
           
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Schedule of estimated useful lives of property, plant and equipment

Buildings and building improvements

   3 - 20 years

Machinery and equipment

   2 - 20 years

Furniture and fixtures

   3 - 10 years

Automotive equipment

   3 - 10 years
Schedule of other assets

 
   December 31,  
 
   2013   2012  

Deferred financing costs

   $ 90   $ 136  

Other

     105     109  
           
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   $ 195   $ 245  
           
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Schedule of computation of basic and diluted income per common share

 

 
   Years Ended December 31,  
 
   2013   2012   2011  

Net income for basic and diluted income per common share

   $ 14,800   $ 16,423   $ 22,186  
               
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Weighted-average shares for basic income per common share

     5,561,429     5,705,475     6,343,992  

Effect of dilutive securities:

                    

Employee and director stock options(1)

     9,850     10,286     18,449  
               
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Adjusted weighted-average shares and assumed exercises for diluted income per common share

     5,571,279     5,715,761     6,362,441  
               
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Basic net income per common share

   $ 2.66   $ 2.88   $ 3.50  
               
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Diluted net income per common share

   $ 2.66   $ 2.87   $ 3.49  
               
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(1)
Excludes 15,000, 17,400 and 7,500 stock options in 2013, 2012 and 2011, respectively, as antidilutive because the exercise price exceeded the average per share market price for the periods presented.