Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Stock Option Plans (Details Textual)

v3.7.0.1
Note 6 - Stock Option Plans (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Employee Stock Option [Member]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 619,173 $ 884,183 $ 619,173 $ 884,183
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 182 days 2 years 270 days
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount 110,305 133,330 $ 244,115 $ 266,601
Non-employee Options [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount $ 10,835 $ 8,421 $ 6,257 $ 9,596