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Note 9 - Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Share-based Compensation, Activity [Table Text Block]
   
 
Number of Shares
   
Weighted Average
Exercise Price
 
Outstanding at December 31, 2017
   
7,024,275
    $
0.29
 
Granted
   
3,000,000
     
0.03
 
Exercised
   
--
     
--
 
Forfeited or expired
   
(169,334
)    
2.46
 
Outstanding at September 30, 2018
   
9,854,941
    $
0.17
 
Exercisable at September 30, 2018
   
4,890,618
    $
0.29