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Note 12 - Subsequent Events (Details Textual) - USD ($)
3 Months Ended
May 07, 2018
Mar. 31, 2018
Mar. 31, 2017
Debt Conversion, Original Debt, Amount   $ 141,763
Convertible Notes Maturing on June 1, 2018, June 17, 2019, December 31, 2019 and June 20, 2020 [Member] | Subsequent Event [Member]      
Debt Conversion, Converted Instrument, Shares Issued 15,747,482    
Debt Conversion, Original Debt, Amount $ 4,133,738    
Debt Conversion, Converted Instrument, Incentive Shares Issuable for Payment of Interest $ 1.50    
Debt Conversion, Converted Instrument, Incentive Shares Issuable for Payment of Interest, Calculated Price 0.25    
Maximum Conversion Price Available for Conversion Option of a Convertible Debt Instrument For Holders With Debt Instruments With a Conversion Price Over $0.30 0.30    
Convertible Notes Maturing on June 1, 2018, June 17, 2019, December 31, 2019 and June 20, 2020 at a Conversion Price of $0.25 [Member] | Subsequent Event [Member]      
Debt Instrument, Convertible, Conversion Price 0.25    
Convertible Notes Maturing on June 1, 2018, June 17, 2019, December 31, 2019 and June 20, 2020 at a Conversion Price of $0.30 [Member] | Subsequent Event [Member]      
Debt Instrument, Convertible, Conversion Price 0.30    
Convertible Notes With Original Conversion Prices of $0.35 [Member] | Subsequent Event [Member]      
Debt Instrument, Convertible, Conversion Price $ 0.35    
Debt Instrument, Convertible, Conversion Option, Percentage of Additional Funding Required, Holders With a Conversion Price Over $0.30 6.00%    
Convertible Notes with Original Conversion Prices of $0.55 and $0.57 [Member] | Subsequent Event [Member]      
Debt Instrument, Convertible, Conversion Option, Percentage of Additional Funding Required, Holders With a Conversion Price Over $0.30 20.00%    
Convertible Notes With Original Conversion Prices of $0.55 [Member] | Subsequent Event [Member]      
Debt Instrument, Convertible, Conversion Price $ 0.55    
Convertible Notes With Original Conversion Prices of $0.57 [Member] | Subsequent Event [Member]      
Debt Instrument, Convertible, Conversion Price $ 0.57    
Convertible Notes Related to 38 Holders Reduced to the Conversion Price of $0.30 [Member] | Subsequent Event [Member]      
Proceeds From Conversion Price Reduction Option $ 261,781