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Note 7 - Warrants and Registration Rights Agreements (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   
 
 
 
 
Weighted Average
 
   
Shares
   
Exercise Price
 
                 
                 
Outstanding, December 31, 2017
   
15,855,017
     
0.18
 
                 
Granted
   
500,000
     
-
 
Canceled / Expired
   
(500,000
)    
-
 
Exercised
   
-
     
-
 
Outstanding, March 31, 2018
   
15,855,017
     
0.18