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Note 6 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2014
Stockholders' Equity Note [Abstract]  
Schedule of Share-based Compensation, Activity [Table Text Block]
   

Number of Shares

   

Weighted Average

Exercise Price

 

Outstanding at December 31, 2013

    1,197,044     $ 3.79  

Granted

    --       --  

Exercised

    --       --  

Forfeited or expired

    (201,744 )     2.05  

Outstanding at March 31, 2014

    995,300     $ 4.15  

Exercisable at March 31, 2014

    629,293     $ 6.19  
Schedule of Stock by Class [Table Text Block]

Series B Convertible Preferred Stock

    3,714,286  

Common Stock Purchase Warrants

    8,284,826  

Equity Incentive Plans

    1,197,529  

Total

    13,196,641