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
Mar. 31, 2017
Mar. 31, 2016
Employee Stock Option [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount $ 133,810 $ 134,405
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 734,114 $ 1,026,024
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 255 days 2 years 361 days
Non-employee Options [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount $ 17,092 $ 1,175