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Note 13 - Subsequent Events (Details Textual) - $ / shares
1 Months Ended
Nov. 13, 2017
Oct. 17, 2017
Aug. 09, 2017
May 11, 2017
Mar. 15, 2017
Aug. 10, 2016
May 11, 2016
Mar. 08, 2016
May 31, 2017
Nov. 06, 2017
Aug. 07, 2017
Mar. 09, 2015
Maximum Ownership as a Result of Conversion                     9.99%  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                       47,917
Stock Issued During Period, Shares, Issued for Services                 61,667      
Director [Member]                        
Stock Issued During Period, Shares, Issued for Services     5,148 1,925 1,895 3,125 3,431 8,333        
Conversion of Series A-1 Shares into Common Stock [Member]                        
Conversion of Stock, Shares Issued   761,222                    
Subsequent Event [Member]                        
Maximum Ownership as a Result of Conversion   35.00%                    
Subsequent Event [Member] | Director [Member]                        
Stock Issued During Period, Shares, Issued for Services 2,276                      
Subsequent Event [Member] | Consultancy Firm [Member]                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                   100,000    
Subsequent Event [Member] | Conversion of Series A-1 Shares into Common Stock [Member]                        
Conversion of Stock, Shares Converted   27,404                    
Preferred Stock, Conversion Price   $ 3.60