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Note 8 - Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Share-based Compensation, Activity [Table Text Block]
   
Number of Shares
   
Weighted Average
Exercise Price
 
Outstanding at December 31, 2015
    1,705,500     $ 2.41  
Granted
    --       --  
Exercised
    --       --  
Forfeited or expired
    --       --  
Outstanding at September 30, 2016
    1,705,500     $ 2.41  
Exercisable at September 30, 2016
    923,061     $ 4.31  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   
Number of Shares
   
Weighted Average
Exercise Price
 
Outstanding at December 31, 2015
    56,442,157     $ 0.14  
Granted
    --       --  
Exercised
    (15,821,920 )     0.065  
Forfeited or expired
    --       --  
Outstanding at September 30, 2016
    40,620,237     $ 0.16  
Exercisable at September 30, 2016
    38,568,159     $ 0.16  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended September 30,
   
Nine Months Ended September 30,
 
   
2016
   
2015
   
2016
   
2015
 
Stock Option Expense
  $ 13,686     $ 16,926     $ 41,058     $ 50,516  
Warrant Modification Expense
    15,030       -       484,829       -  
Total Stock-Based Compensation Expense
  $ 28,716     $ 16,926     $ 525,887     $ 50,516  
Schedule of Stock by Class [Table Text Block]
Series B Convertible Preferred Stock
 
 
285,714
 
Series C Convertible Preferred Stock
 
 
30,460,662
 
Common Stock Purchase Warrants
 
 
40,620,237
 
Equity Incentive Plans
 
 
4,722,529
 
Total
 
 
76,089,142