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Note 7 - Warrants and Registration Rights Agreements (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   
Shares

Underlying
Warrants
   
Weig
h
ted Average
Exercise Price
 
                 
Outstanding, December 31, 2017
   
15,855,017
    $
0.18
 
Granted
   
3,000,000
     
0.14
 
Canceled / Expired
   
(500,000
)    
0.76
 
Exercised
   
-
     
-
 
                 
Outstanding, September 30, 2018
   
18,355,017
    $
0.15