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Note 4 - Net Loss per Common Share (Tables)
6 Months Ended
Jun. 30, 2014
Earnings Per Share [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

June 30, 2014

   

June 30, 2013

 

Options to purchase common shares

    1,386       301  

Common share purchase warrants

    1,001       919