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Stock Options (Details Textual)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Employee Service Share-Based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized | $ $ 2.0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 28 months
2013 Stock Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares Authorized 2,138,655
2009 Stock Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 41,096