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Note 9 - Loss Per Share (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For the six months ended June 30,
      2018       2019  
         
Net income / (loss), continuing operations    
771,825
      
(765,615
 )
Dividend Series B Preferred shares    
(850,708
 )    
(949,152
 )
Preferred deemed dividend    
-
      
(504,577
 )
Net loss attributable to common shareholders, continuing operations    
(78,883
 )    
(2,219,344
 )
Weighted average common shares – outstanding, continuing operations    
11,133,764
      
12,340,060
  
Basic and diluted loss per share, continuing operations    
(0.01
 )    
(0.18
 )
Net loss attributable to common shareholders, discontinued operations    
(1,421,001
 )    
-
  
Net loss attributable to common shareholders    
(1,499,884
 )    
(2,219,344
 )
Basic and diluted loss per share    
(0.13
 )    
(0.18
 )