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Note 8 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 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 June 30, 2016
    1,705,500     $ 2.41  
Exercisable at June 30, 2016
    918,061     $ 4.34  
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
    (5,064,588 )     0.065  
Forfeited or expired
    --       --  
Outstanding at June 30, 2016
    51,377,569     $ 0.14  
Exercisable at June 30, 2016
    39,775,491     $ 0.15  
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
    51,377,569  
Equity Incentive Plans
    4,722,529  
Total
    86,846,474