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Indebtedness (Details) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Revolving credit facility
Jan. 29, 2009
Revolving credit facility
Dec. 31, 2012
Revolving credit facility
LIBOR
Dec. 31, 2012
Revolving credit facility
LIBOR
Minimum
Dec. 31, 2012
Revolving credit facility
LIBOR
Maximum
Dec. 31, 2012
Revolving credit facility
Prime rate
Dec. 31, 2012
Revolving credit facility
Prime rate
Minimum
Dec. 31, 2012
Revolving credit facility
Prime rate
Maximum
Jan. 29, 2009
Term loan
Dec. 31, 2012
Mortgage notes
Dec. 31, 2011
Mortgage notes
Jan. 29, 2009
Mortgage loan, one
Jan. 29, 2009
Mortgage loan, two
Dec. 31, 2012
Note payable
Dec. 31, 2011
Note payable
Oct. 11, 2012
Equipment loan
item
Dec. 31, 2012
Equipment loan
Indebtedness                                      
Maximum borrowing capacity       $ 17,000,000                              
Aggregate principal amount                     2,100,000     1,800,000 4,000,000     5,000,000  
Debt amortization period                     7 years     20 years 20 years       5 years
Available borrowing capacity     16,900,000                                
Variable interest rate         LIBOR     prime rate                      
Margin over variable interest rate (as a percent)           1.00% 1.50%   0.00% 0.25%                  
Interest rate at end of period (as a percent)     1.20%                                
Interest rate at end of period (as a percent)                                   1.83%  
Number of machines financed                                   2  
Number of machines operational                                   1  
Amount advanced on loan                                     4,400,000
Long-term debt                                      
Total long-term debt 9,863,899 6,219,319                   4,725,516 5,017,817     913,142 1,201,502   4,225,241
Current installments (1,550,190) (580,661)                                  
Long-term debt, excluding current installments 8,313,709 5,638,658                                  
Aggregate maturities of long-term debt                                      
2013 1,550,190                                    
2014 1,568,334                                    
2015 1,586,815                                    
2016 4,921,605                                    
2017 $ 236,955