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Stock-Based Compensation (Details 1) - Employee Stock Option [Member] - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Summary of all stock option plans / warrant activity    
Number of Shares/Warrants, Options outstanding and exercisable, Beginning Balance 175,600 184,600
Number of Shares, Options granted  
Number of Shares, Options exercised
Number of Shares, Options cancelled or expired (105,800) (9,000)
Number of Shares/Warrants, Options outstanding and exercisable Ending Balance 99,800 175,600
Weighted Average Exercise Price, Options outstanding and exercisable, Beginning Balance $ 41.99 $ 43.90
Weighted Average Exercise Price, Options granted 15.00
Weighted Average Exercise Price, Options exercised
Weighted Average Exercise Price, Options cancelled or expired 41.36 82.10
Weighted Average Exercise Price, Options outstanding and exercisable, Ending Balance $ 34.55 $ 41.99
Options outstanding, Weighted Average Remaining Contractual Life (years) 1 year 6 months 25 days 1 year 6 months 25 days
Options exercisable and expected to vest, Weighted Average Remaining Contractual Life (years) 1 year 4 months 28 days  
Options outstanding, Aggregate Intrinsic Value
Options exercisable and expected to vest, Aggregate Intrinsic Value
Weighted Average Exercise Price, Options exercisable and expected to vest, Ending Balance