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Note 5 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2013
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Number of Shares
   
Weighted Average
Exercise Price
 
Outstanding at December 31, 2012
    1,069,141     $ 4.50  
Granted
    --       --  
Exercised
    --       --  
Forfeited or expired
    (14,999 )     15.28  
Outstanding at March 31, 2013
    1,054,142     $ 4.35  
Exercisable at March 31, 2013
    695,796     $ 6.15  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   
Number of Shares
   
Weighted Average
Exercise Price
 
Outstanding at December 31, 2012
    11,225,559     $ 2.06  
Issued
    --       --  
Exercised
    (1,766,667 )     0.60  
Forfeited or expired
    --       --  
Outstanding at March 31, 2013
    9,458,892     $ 2.29  
Exercisable at March 31, 2013
    8,292,226     $ 2.47  
Common Stock Reserved for Future Issuance [Table Text Block]
Series A Convertible Preferred Stock
    1,050,667  
Common Stock Purchase Warrants
    9,458,892  
Equity Incentive Plans
    1,197,529  
Total
    11,707,088