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Note 7 - Notes payable (related party) (Details) - Convertible Debt [Member] - USD ($)
Jul. 06, 2018
Jun. 28, 2018
Mar. 20, 2017
Dec. 19, 2016
Note 7 - Notes payable (related party) (Details) [Line Items]        
Debt Instrument, Face Amount     $ 6,869,818 $ 6,869,818
Debt Instrument, Interest Rate, Stated Percentage     3.00% 6.00%
Debt Instrument, Convertible, Conversion Price   $ 0.35   $ 1.50
Debt Instrument, Maturity Date, Description     renewable for up to an additional 12 months at the Purchaser’s option  
Debt Instrument, Term     12 months  
Debt Conversion, Converted Instrument, Shares Issued 19,628,050 19,628,050    
Common Stock, Par or Stated Value Per Share   $ 0.001    
Debt Conversion, Original Debt, Amount $ 6,869,818 $ 6,869,818