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Note 8 - Common Stock (Tables)
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Notes Tables    
Schedule of Conversions of Convertible Preferred Stock [Table Text Block]  
   
2014
    
2013
    
2012
  
Conversion of Series A Preferred Shares
    202,857       2,048,570       1,882,667  
Conversion of Series B Preferred Shares
    4,428,571       -0-       -0-  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   
Number of Shares
    
Weighted Average
Exercise Price
  
Outstanding at December 31, 2014
     5,108,826     $ 0.66  
Issued – Series D Warrants (1)
     16,666,666       0.17  
Issued – Series E Warrants (1)
     16,666,666       0.14  
Issued – Series F Warrants (1)     16,666,666       0.17  
Issued – Placement Agent Warrants (1)
     1,333,333       0.17  
Outstanding at June 30, 2015
     56,442,157     $ 0.20  
Exercisable at June 30, 2015
     39,775,491     $ 0.21  
Expiration Date
  
Number of Shares
    
Weighted Average
Exercise Price
  
December 31, 2016
     1,806,159     $ 1.00  
January 16, 2017
     45,000       1.00  
January 31, 2017
     567,001       1.00  
March 21, 2017
     2,690,666       0.35  
Total Outstanding at December 31, 2014
     5,108,826     $ 0.66  
Schedule of Stock by Class [Table Text Block]
Series B Convertible Preferred Stock
     285,714  
Series C Convertible Preferred Stock
     21,126,760  
Common Stock Purchase Warrants
     56,442,157  
Equity Incentive Plans
     1,197,529  
Total
     79,052,160  
Stock Purchase Warrants
     5,108,826  
Stock Option Plan
     1,197,529  
Series B Convertible Preferred Stock
     285,715  
Total
     6,592,070