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Summary of Significant Accounting Policies (Details 1)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Stock options with an exercise price of $3.30 per share [Member]
    
Schedule of anti-dilutive securities excluded from computation of earnings per share    
Out of the money options and warrants excluded 100,000  
Stock options with an exercise price of $3.43 per share [Member]
    
Schedule of anti-dilutive securities excluded from computation of earnings per share    
Out of the money options and warrants excluded 40,000  
Stock options with an exercise price of $3.50 per share [Member]
    
Schedule of anti-dilutive securities excluded from computation of earnings per share    
Out of the money options and warrants excluded 345,000 245,000
Stock options with an exercise price of $3.51 per share [Member]
    
Schedule of anti-dilutive securities excluded from computation of earnings per share    
Out of the money options and warrants excluded 959,500 984,670
Stock options with an exercise price of $3.53 per share [Member]
    
Schedule of anti-dilutive securities excluded from computation of earnings per share    
Out of the money options and warrants excluded 194,100 211,900
Stock options with an exercise price of $3.90 per share [Member]
    
Schedule of anti-dilutive securities excluded from computation of earnings per share    
Out of the money options and warrants excluded 20,000  
Stock options with an exercise price of $4.00 per share [Member]
    
Schedule of anti-dilutive securities excluded from computation of earnings per share    
Out of the money options and warrants excluded 52,500 52,500
Stock options with an exercise price of $5.00 per share [Member]
    
Schedule of anti-dilutive securities excluded from computation of earnings per share    
Out of the money options and warrants excluded 200,000 400,000
Stock options with an exercise price of $7.00 per share [Member]
    
Schedule of anti-dilutive securities excluded from computation of earnings per share    
Out of the money options and warrants excluded 100,000 100,000
Warrants with an exercise price of $4.32 per share [Member]
    
Schedule of anti-dilutive securities excluded from computation of earnings per share    
Out of the money options and warrants excluded   1,302,083
Warrants with an exercise price of $3.60 per share [Member]
    
Schedule of anti-dilutive securities excluded from computation of earnings per share    
Out of the money options and warrants excluded 1,562,500  
Warrants with an exercise price of $5.25 per share [Member]
    
Schedule of anti-dilutive securities excluded from computation of earnings per share    
Out of the money options and warrants excluded   100,000
Options and warrants excluded from diluted EPS [Member]
    
Schedule of anti-dilutive securities excluded from computation of earnings per share    
Out of the money options and warrants excluded 3,573,600 3,396,153