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Note 11 - Subsequent Events (Details Textual) - shares
1 Months Ended 2 Months Ended 6 Months Ended
Jul. 31, 2017
Jun. 30, 2017
Jun. 30, 2017
Aug. 04, 2017
Dec. 31, 2016
Common Stock, Shares Authorized   300,000,000 300,000,000   300,000,000
Conversion of Series C Preferred Stock Into Common Stock [Member]          
Stock Issued During Period, Shares, New Issues   3,862,000 3,862,000    
Conversion of Stock, Shares Converted   58 58    
Subsequent Event [Member]          
Common Stock, Shares Authorized       600,000,000  
Subsequent Event [Member] | Conversion of Series C Preferred Stock Into Common Stock [Member]          
Stock Issued During Period, Shares, New Issues 4,000,000        
Conversion of Stock, Shares Converted 60