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Note 16 - Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
    Fair Value Measurement as of December 31, 2018
      Total,       (Level 1)       (Level 2)    
 
 
(Level 3)
 
Liabilities                
Interest rate swap contract, current portion   $
41,435
     
-
    $
41,435
     
-
 
Fair Value Measurements, Nonrecurring [Table Text Block]
    December 31, 2017
      Fair Value       Level 1       Level 2       Level 3       Loss 2017  
Vessel profit participating liability  
$1,297,100
     
-
   
$1,297,100
     
-
     
-
 
Vessels held for sale  
$5,000,000
     
-
   
$5,000,000
     
-
   
$4,595,819
 
    December 31, 2018
      Fair Value       Level 1       Level 2       Level 3       Loss 2018  
Vessel profit participating liability  
$1,067,500
     
-
   
$1,067,500
     
-
     
-
 
     
December 31, 2019
     
Fair Value
     
Level 1
     
Level 2
     
Level 3
     
Loss 2019
 
Vessel profit participating liability    
-
     
-
     
-
     
-
     
-