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Note 10 - (Loss) Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    For the nine months
ended September 30,		  
    2019     2020  
             
Net (loss) / income    
(917,545
 )    
3,466,124
  
Dividend Series B Preferred shares    
(1,110,467
 )    
(524,621
 )
Preferred deemed dividend    
(504,577
 )    
-
  
Net (loss) / income attributable to common shareholders    
(2,532,589
 )    
2,941,503
  
Weighted average common shares – outstanding    
2,129,233
      
5,621,159
  
Basic and diluted (loss) / earnings per share    
(1.19
 )    
0.52