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Shareholders' Equity (Schedule of Activity in Options and Warrants) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employee Stock Option [Member]
        
Number of Shares Underlying Warrants and Options        
Balance 1,117,899 1,269,649 1,734,199  
Granted/Issued 499,700       
Cancelled/Terminated (64,500) (151,750) (379,550)  
Exercised (72,500)    (85,000)  
Balance 1,480,599 1,117,899 1,269,649 1,734,199
Weighted Average Exercise Price        
Balance $ 9.03 $ 9.48 $ 11.64  
Granted/Issued $ 5.26       
Cancelled/Terminated $ 12.81 $ 12.76 $ 20.43  
Exercised $ 4.83    $ 3.72  
Balance $ 7.80 $ 9.03 $ 9.48 $ 11.64
Weighted Average Remaining Contractual Term (Years) 5 years 2 months 12 days 3 years 8 months 12 days 4 years 2 months 12 days 4 years 3 months 18 days
Aggregate Intrinsic Value $ 399,000 $ 4,250    $ 281,600
Non-Employee Stock Options and Warrants [Member]
        
Number of Shares Underlying Warrants and Options        
Balance 1,512,103 704,257 708,909  
Granted/Issued    807,846     
Cancelled/Terminated (25,000)        
Exercised (107,483)    (4,652)  
Balance 1,379,620 1,512,103 704,257  
Weighted Average Exercise Price        
Balance $ 5.56      
Granted/Issued    $ 5.12     
Cancelled/Terminated $ 9.00        
Exercised $ 4.45    $ 5.64  
Balance $ 5.58 $ 5.56    
Non-Employee Stock Options and Warrants [Member] | Minimum [Member]
        
Weighted Average Exercise Price        
Balance     $ 5.00 $ 5.00
Non-Employee Stock Options and Warrants [Member] | Maximum [Member]
        
Weighted Average Exercise Price        
Balance     $ 9.00 $ 9.00