Quarterly report pursuant to Section 13 or 15(d)

Stock Plans (Details Textual)

v3.7.0.1
Stock Plans (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average period for recognizing non-vested stock option 1 year 3 months 18 days  
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 1,302,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 436,000 168,000