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Note 14 - Subsequent Events (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Nov. 14, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Common Stock, Shares, Issued, Total   48,199,073   33,859,034
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 1.49   $ 2.55
Proceeds from Warrant Exercises   $ 1,974,547  
Subsequent Event [Member]        
Common Stock, Shares, Issued, Total 239,629      
Subsequent Event [Member] | The 2019 Warrants [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.50      
Proceeds from Warrant Exercises $ 119,813