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Note 9 - Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For the three months
ended March 31,
 
    2016     2017  
             
Net loss attributable to common shareholders    
(3,262,027
)    
(2,627,562
)
Weighted average common shares – Outstanding    
8,104,860
     
10,999,554
 
Basic and diluted  loss per share    
(0.40
)    
(0.24
)