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Note 8 - Common Stock (Tables)
 3 Months Ended
Mar. 31, 2015
Notes Tables  
Schedule of Share-based Compensation, Activity [Table Text Block]
   
Number of Shares
    
Weighted Average
Exercise Price
  
Outstanding at December 31, 2014
     1,183,100     $ 3.50  
Granted
     26,400       0.15  
Exercised
     --       --  
Forfeited or expired
     (32,000 )     0.94  
Outstanding at March 31, 2015
     1,177,500     $ 3.49  
Exercisable at March 31, 2015
     753,594     $ 5.27  
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       0.22  
Issued – Series E Warrants (1)
     16,666,666       0.18  
Issued – Series F Warrants (1)
     16,666,666       0.22  
Issued – Placement Agent Warrants (1)     1,333,333       0.22  
Outstanding at March 31, 2015
     56,442,157     $ 0.24  
Exercisable at March 31, 2015
     39,775,491     $ 0.25  
Schedule of Stock by Class [Table Text Block]
Series B Convertible Preferred Stock
     285,714  
Series C Convertible Preferred Stock
     16,666,666  
Common Stock Purchase Warrants
     56,442,157  
Equity Incentive Plans
     1,197,529  
Total
     74,592,066