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Note 12 - Related Party Transactions (Details Textual) - Scenario, Unspecified [Domain] - USD ($)
2 Months Ended 12 Months Ended
Jan. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2015
Feb. 28, 2015
May. 14, 2013
Apr. 30, 2013
Jan. 17, 2013
Emory [Member] | Ongoing Patent Cost Reimbursements [Member]                  
Related Party Transaction, Expenses from Transactions with Related Party   $ 179,958 $ 98,042 $ 89,885          
Emory [Member] | Research Agreements [Member]                  
Related Party Transaction, Expenses from Transactions with Related Party   0 252,478 552,403          
Members Of Board Of Directors And Management [Member]                  
Stock Issued During Period, Shares, New Issues 380,954                
Proceeds from Issuance of Common Stock $ 255,239                
Class Of Warrant Or Right Purchase Period 5 years                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 571,432                
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 1                
Proceeds from Issuance of Common Stock   $ 873,400 $ 1,643,333 $ 310,160          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights           49,999,998      
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.66   $ 0.75 $ 0.20   $ 0.50 $ 0.60 $ 0.60