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Note 12 - Subsequent Events (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Debt Conversions [Table Text Block]
Note Description
  
Principal Outstanding
March 31, 2018
    
Amount Converted to
Stock
    
Principal Amount
Remaining
  
Convertible notes, mature June 1, 2018
   $
4,468,847
     $
(3,154,467
 )   $
1,314,380
  
Convertible notes, mature June 17, 2019
   $
283,571
     $
(283,571
 )    
---
  
Convertible notes, mature December 31, 2019
   $
292,000
     $
(217,000
 )   $
75,000
  
Convertible notes, mature June 20, 2020
   $
603,700
     $
(478,700
 )   $
125,000