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Shareholders' Equity (Details Textual) (USD $)
 3 Months Ended 12 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Issuance Of Equity [Member]
July 30, 2012 [Member]
Dec. 31, 2012
Issuance Of Equity [Member]
October 3 2012 [Member]
Dec. 31, 2010
Issuance Of Equity [Member]
September 17 2010 [Member]
Dec. 31, 2012
Issuance Of Equity [Member]
August 28, 2012 [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2010
Restricted Stock [Member]
Dec. 31, 2012
Directors [Member]
Restricted Stock [Member]
Dec. 31, 2011
Directors [Member]
Restricted Stock [Member]
Dec. 31, 2010
Directors [Member]
Restricted Stock [Member]
Dec. 31, 2012
Employees [Member]
Restricted Stock [Member]
Dec. 31, 2011
Employees [Member]
Restricted Stock [Member]
Dec. 31, 2011
Certain Employees [Member]
Restricted Stock [Member]
Dec. 31, 2012
Warrant [Member]
Dec. 31, 2011
Warrant [Member]
Dec. 31, 2010
Warrant [Member]
Dec. 31, 2009
Warrant [Member]
Dec. 31, 2012
Warrant [Member]
Two Consultants [Member]
Payments for Fees (in dollars)           $ 4,455 $ 336,750 $ 9,277 $ 413,719                            
Warrants Issued Exercise Price (in dollars per share)     $ 4.45                                        
Warrants Issued Exercise Price On Six Month Anniversary Of Closing Date (in dollars per share)     $ 6.73                                        
Percentage Of Offering Price     150.00%                                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     750,000                                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     388,508                                        
Number of Shares Subject to Option, Granted       0 176,000         363,200     96,500 63,000 40,500 5,100 139,000 3,000         60,000
Stock or Unit Option Plan Expense 424,000 444,000     406,560                                    
Cashless Exercise of Stock Options     0 276,750 0                                    
Stock Options Cashless Exercise       75,000                                      
Stock Options Cashless Exercise Forfeited       29,270                                      
Exercisable Fair Market Value Stock Options       276,896                                      
Proceeds From Stock Options Exercised       39,744                                      
Warrants Exercisable     1,218,353                                        
Warrants Exercisable Weighted Average Exercise Price (in dollars per share)     5.37                                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                                     807,846 0 343,748    
Warrants Issued Weighted Average Exercise Price (in dollars per share)                                     $ 5.12 $ 0 $ 5.91   $ 3.95
Allocated Share-based Compensation Expense, Net of Tax (in dollars)     873,888 719,811 696,888                           4,690 (16,974) 75,716    
Restricted Stock Issued To Employees Vest Ratably                               $ 261,600 $ 136,000            
Restricted Stock Market Value Per Share On Date Of Grant (in dollars per share)                     $ 5.20 $ 3.69       $ 3.38              
Deferred Compensation Liability, Current (in dollars)     236,000                                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                   218,733 90,667 65,768             1,512,103 704,257 708,909 500,161  
Proceeds From Stock Warrants Exercised       26,233                                      
Deferred Compensation Liability, Classified, Noncurrent     $ 589,000