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Note 9 - Convertible Notes (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
September 30, 2019
   
December 31, 2018
 
Convertible note payable, due on demand, bearing interest at 7% per annum with conversion rights for 335,833 common shares.
  $
834,169
    $
809,755
 
                 
Convertible notes payable to multiple private investors, including certain notes in default, bearing interest at 5% per annum with conversion rights for 3,111,015 common shares, maturing at various dates between May 2018 and September 2021.
   
5,017,556
     
4,333,892
 
                 
Total convertible notes payable
   
5,851,725
     
5,143,647
 
Less current portion
   
4,823,238
     
3,597,760
 
Convertible notes payable, less current portion
  $
1,028,487
    $
1,545,887