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Stock-Based Compensation (Details 1) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary of all stock option plans / warrant activity      
Number of Shares/Warrants, Options Outstanding, Beginning Balance 1,709,400    
Number of Shares/Warrants, Options Outstanding, Ending Balance   1,709,400  
Stock Options [Member]      
Summary of all stock option plans / warrant activity      
Number of Shares/Warrants, Options Outstanding, Beginning Balance 1,709,400 1,600,583 1,715,200
Number of Shares, Options Granted 605,000 405,200 145,000
Number of Shares, Options Exercised (241,361)
Number of Shares, Options Cancelled or expired (130,283) (296,383) (18,256)
Number of Shares/Warrants, Options Outstanding, Ending Balance 2,184,117 1,709,400 1,600,583
Weighted Average Exercise Price, Options Outstanding, Beginning Balance $ 4.92 $ 5.22 $ 5.04
Weighted Average Exercise Price, Options Granted $ 3.57 $ 6.31 6.06
Weighted Average Exercise Price, Options Exercised 4.39
Weighted Average Exercise Price,Options Cancelled or expired $ 6.03 $ 5.46 5.57
Weighted Average Exercise Price, Options Outstanding, Ending Balance $ 4.48 $ 4.92 $ 5.22
Options Outstanding, Weighted Average Remaining Contractual Life (years) 3 years 7 months 24 days    
Options exercisable and expected to vest, Weighted Average Remaining Contractual Life (years) 3 years 3 months 18 days    
Options outstanding, Aggregate intrinsic value $ 10,740    
Options exercisable and expected to vest, Aggregate intrinsic value $ 4,006    
Number of Shares/Warrants, Options exercisable and expected to vest, Ending Balance 1,888,436    
Weighted Average Exercise Price, Options exercisable and expected to vest, Ending balance $ 4.63