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Stock Options (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-Based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized     $ 1.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 0.6 $ 0.5  
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