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Note 8 - Collaborative Agreements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended 133 Months Ended 139 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Jun. 30, 2016
University of Toronto [Member] | Employee Stock Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period             10 years  
University of Toronto [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price         $ 1   $ 1  
University of Toronto [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price         0.26   $ 0.26  
University of Toronto [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures             25,000  
Professor [Member] | Employee Stock Option [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period             13 years 13 years
Professor [Member] | Employee Stock Option [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period             10 years 10 years
Professor [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 1   $ 1   1   $ 1 $ 1
Professor [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price         0.26   $ 0.26  
Professor [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures             483,299 275,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price         $ 1   $ 1  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares 125,000   125,000   62,500   62,500 125,000
In Process Research and Development [Member]                
Research and Development Expense $ 3,000 $ 7,056            
Research and Development Expense $ 374,206 $ 39,975 $ 422,721 $ 61,424 $ 456,274 $ 191,069