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Note 11 - Subsequent Events (Details Textual) - USD ($)
 1 Months Ended
May 11, 2017
Apr. 30, 2017
Mar. 31, 2017
Stock Issued During Period, Shares, Warrants Exercised     983,334
Proceeds from Warrant Exercises     $ 49,167
Subsequent Event [Member]      
Stock Issued During Period, Shares, Warrants Exercised   2,500,000  
Proceeds from Warrant Exercises   $ 100,000  
Subsequent Event [Member] | Series D Convertible Preferred Stock [Member]      
Stock Issued During Period, Shares, New Issues 1,000    
Stock Issued During Period, Value, New Issues $ 1,000,000    
Convertible Preferred Stock, Shares Issued upon Conversion 66,666.67    
Convertible Preferred Stock, Total Shares Issued upon Conversion 66,666,667