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Indebtedness (Details) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 02, 2013
Revolving credit facility
Dec. 31, 2013
Revolving credit facility
Dec. 31, 2013
Revolving credit facility
LIBOR
Dec. 31, 2013
Revolving credit facility
LIBOR
Minimum
Dec. 31, 2013
Revolving credit facility
LIBOR
Maximum
Dec. 31, 2013
Revolving credit facility
Prime rate
Dec. 31, 2013
Revolving credit facility
Prime rate
Minimum
Dec. 31, 2013
Revolving credit facility
Prime rate
Maximum
Oct. 11, 2012
Equipment loans
item
Dec. 31, 2013
Equipment loans
Dec. 31, 2012
Equipment loans
Dec. 31, 2012
Mortgage notes
Dec. 31, 2012
Note payable
Indebtedness                              
Maximum borrowing capacity     $ 40,000,000                        
Debt instrument period                       5 years      
Borrowings outstanding       0                      
Variable interest rate         LIBOR     prime rate              
Margin over variable interest rate (as a percent)           1.00% 1.50%   0.00% 0.25%          
Interest rate (as a percent)                     1.83%        
Number of machines financed                     2        
Amount advanced on loan                       5,000,000      
Repayments of debt     5,100,000                        
Long-term debt                              
Total long-term debt 3,843,000 9,864,000                   3,843,000 4,225,000 4,726,000 913,000
Current installments (976,000) (1,550,000)                          
Long-term debt, excluding current installments 2,867,000 8,314,000                          
Aggregate maturities of long-term debt                              
2014 976,000                            
2015 995,000                            
2016 1,013,000                            
2017 859,000                            
Total long-term debt $ 3,843,000 $ 9,864,000                   $ 3,843,000 $ 4,225,000 $ 4,726,000 $ 913,000