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Stock Option Plans and Warrants to Purchase Common Stock (Details) - Equity Incentive Plan [Member] - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Summary of equity incentive plan    
Shares available for grant at plan approval 300,000
Options granted (47,700)
Shares available for grant at end of year 252,300 300,000