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Note 9 - Loss Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For the six months
ended June 30,
    2017   2018
         
Net loss attributable to common shareholders’, continuing operations    
(3,033,754
 )    
(78,883
 )
                 
Weighted average common shares – Outstanding
   
11,030,754
      
11,133,764
  
                 
Basic and diluted loss per share, continuing operations    
(0.28
 )    
(0.01
 )
                 
Net loss attributable to common shareholders    
(4,111,296
 )    
(1,499,884
 )
                 
Basic and diluted loss per share    
(0.37
 )    
(0.13
 )