Quarterly report pursuant to Section 13 or 15(d)

Stock Plans (Details Textual)

v3.10.0.1
Stock Plans (Details Textual) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average period for recognizing non-vested stock option     8 months 12 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 $ 0.6   $ 0.6  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 5,000 60,000 950,000 496,000