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Note 3 - Vessels, Net (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    Costs     Accumulated Depreciation     Net Book Value  
                   
Balance, January 1, 2020    
132,863,067
      
(16,632,734
 )    
116,230,333
  
Depreciation for the period    
-
      
(5,001,837
 )    
(5,001,837
 )
Capitalized expenses    
408,974
      
-
      
408,974
  
Sale of vessels    
(13,402,114
 )    
4,833,441
      
(8,568,673
 )
Balance, September 30, 2020    
119,869,927
      
(16,801,130
 )    
103,068,797