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Note 12 - Subsequent Event (Details Textual) - USD ($)
 1 Months Ended 6 Months Ended
Aug. 05, 2016
Jun. 30, 2016
Subsequent Event [Member] | NIAID Grant [Member]    
Government Contract Receivable $ 199,442  
Subsequent Event [Member] | Additional NIAID Grant [Member]    
Government Contract Receivable $ 7,600,000  
Subsequent Event [Member]    
Class of Warrant or Right, Exercised During Period 5,300,000  
Proceeds from Warrant Exercises $ 344,500  
Class of Warrant or Right, Exercised During Period   (5,064,588)