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Note 9 - Net Loss Per Share (Tables)
12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

For the Years Ended December 31,

 

2013

   

2012

   

2011

 
                         

Number of options outstanding

    6,356       4,324       2,505  

Number of warrants outstanding

    3,969       4,219       4,206  

Common stock related to convertible notes outstanding

    6,291       5,927       1,967