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Stock-Based Compensation (Details 1) - Stock Options [Member] - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary of all stock option plans / warrant activity      
Number of Shares/Warrants, Options Outstanding, Beginning Balance 2,184,117 1,709,400 1,600,583
Number of Shares, Options Granted 25,000 605,000 405,200
Number of Shares, Options Exercised
Number of Shares, Options Cancelled or expired (363,117) (130,283) (296,383)
Number of Shares/Warrants, Options Outstanding, Ending Balance 1,846,000 2,184,117 1,709,400
Weighted Average Exercise Price, Options Outstanding, Beginning Balance $ 4.48 $ 4.92 $ 5.22
Weighted Average Exercise Price, Options Granted 1.44 3.57 6.31
Weighted Average Exercise Price, Options Exercised
Weighted Average Exercise Price,Options Expired/forfeited 4.73 6.03 5.46
Weighted Average Exercise Price, Options Outstanding, Ending Balance $ 4.39 $ 4.48 $ 4.92
Options Outstanding, Weighted Average Remaining Contractual Life (years) 3 years 11 days    
Options exercisable and expected to vest, Weighted Average Remaining Contractual Life (years) 3 years 11 days    
Options outstanding, Aggregate intrinsic value $ 10,000    
Options exercisable and expected to vest, Aggregate intrinsic value $ 10,000    
Number of Shares/Warrants, Options exercisable and expected to vest, Ending Balance 1,846,000    
Weighted Average Exercise Price, Options exercisable and expected to vest, Ending balance $ 4.39