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Stock Option and Equity Incentive Plans (Details 3) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Incentive Plan
Dec. 31, 2012
Options
Dec. 31, 2011
Options
Dec. 31, 2010
Options
Dec. 31, 2012
Restricted Stock Units
Dec. 31, 2011
Restricted Stock Units
Dec. 31, 2010
Restricted Stock Units
Jun. 14, 2012
Common stock
Non-employee members of Board of Directors
Dec. 31, 2012
Common stock
Non-employee members of Board of Directors
Dec. 31, 2011
Common stock
Non-employee members of Board of Directors
Dec. 31, 2012
Common stock
Executive officers
Dec. 31, 2011
Common stock
Executive officers
Dec. 31, 2010
Common stock
Executive officers
Feb. 17, 2012
Common stock
Incentive Plan
Chairman, Chief Executive Officer and President
Dec. 31, 2012
Common stock
Incentive Plan
Chairman, Chief Executive Officer and President
Dec. 31, 2011
Common stock
Incentive Plan
Chairman, Chief Executive Officer and President
Dec. 31, 2010
Common stock
Incentive Plan
Chairman, Chief Executive Officer and President
Stock Option and Equity Incentive Plans                                        
The total intrinsic value of all options exercised         $ 2,039,642 $ 2,204,962 $ 2,711,864                          
Total amount of consideration received from exercise of options 365,241 250,538 507,056   505,708 344,417 850,806                          
Shares surrendered in lieu of payment of exercise price and withholding taxes (in shares)         22,161 20,492 62,202                          
Average market price of shares surrendered in lieu of payment of withholding taxes (in dollars per share)         $ 18.01 $ 17.64 $ 10.42                          
Compensation expense (in dollars)         132,774 141,499 213,716 367,631 463,923 557,494   60,000 60,000         300,000 423,250 192,500
Shares approved for issuance       108,866                         300,000      
Shares of common stock issued                     3,672                  
Closing price (in dollars per share)                     $ 16.32                  
Grant date fair value of stock measured at closing price (in dollars)                           0 55,000 79,248        
Restricted Stock Units                                        
Outstanding at the beginning of the period (in shares)               176,209                        
Awarded (in shares)               13,553                        
Shares distributed (in shares)               (80,896)                        
Outstanding at the end of the period (in shares)               108,866 176,209                      
Weighted Average Award Date Fair Value                                        
Outstanding at the beginning of the period (in dollars per share)               $ 6.98                        
Awarded (in dollars per share)               $ 15.62                        
Shares distributed (in dollars per share)               $ 5.96                        
Outstanding at the end of the period (in dollars per share)               $ 8.77 $ 6.98                      
Net-share settlement (in shares)               25,684 30,920 19,579                    
Net-share settlement, market price per share               $ 16.10 $ 18.19 $ 9.25                    
Future share-based compensation expense                                        
2013 (in dollars) 342,305       70,080     272,225                        
2014 (in dollars) 173,272       43,892     129,380                        
2015 (in dollars) 74,428       12,962     61,466                        
2016 (in dollars) 6,818             6,818                        
Total 596,823       126,934     469,889                        
Tax benefits recognized as additional paid-in capital $ 831,584 $ 699,659 $ 854,015