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Note 17 - Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Disposal Groups, Including Discontinued Operations [Table Text Block]
       
Year Ended December 31
(discontinued operations)
      2017       2018       2019  
Statement of Operations Data        
Voyage revenue    
20,280,215
      
25,934,204
      
-
  
Commissions (including, $253,503, $324,178 and nil respectively, to related party)    
(1,122,196
 )    
(1,411,333
 )    
-
  
Voyage expenses    
(2,396,318
 )    
(410,676
 )    
-
  
Vessel operating expenses (including, $102,131, $115,026 and nil, respectively, to related party)    
(6,892,388
 )    
(9,183,152
 )    
-
  
Drydocking expenses    
(127,509
 )    
(1,465,079
 )    
-
  
Related party management fees    
(1,409,716
 )    
(1,701,340
 )    
-
  
Vessel depreciation    
(4,786,272
 )    
(5,422,155
 )    
-
  
General and administrative expenses (including $693,524, $731,456 and nil, respectively, to related party)    
(917,160
 )    
(2,346,502
 )    
-
  
Operating income    
2,628,656
      
3,993,967
      
-
  
Total other expenses, net    
(1,778,955
 )    
(2,874,232
 )    
-
  
Net income    
849,701
      
1,119,735
      
-
  
Dividend Series B Preferred Shares    
-
      
(565,229
 )    
-
  
Net income attributable to common shareholders    
849,701
      
554,506
      
-