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Note 9 - Common Stock (Tables)
12 Months Ended
Dec. 31, 2013
Stockholders' Equity Note [Abstract]  
Schedule of Stock by Class [Table Text Block]

Stock Purchase Warrants

    8,292,226  

Stock Option Plan

    1,197,529  

Series A Convertible Preferred Stock

    202,857  

Series B Convertible Preferred Stock

    4,714,286  

Total

    14,406,898  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Expiration Date

 

Number of Shares

   

Weighted Average

Exercise Price

 

January 19, 2014

    7,400     $ 1.40  

December 31, 2014

    818,376       16.50  

December 31, 2016

    987,783       1.00  

January 16, 2017

    45,000       1.00  

January 31, 2017

    567,001       1.00  

March 21, 2017

    5,866,666       0.35  

Outstanding at December 31, 2013

    8,292,226     $ 2.07