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Vessels and vessel improvements (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule Of Vessel And Vessel Improvements
 
2018
 
2017
 
 
 
 
Vessel and vessel improvements at the beginning of the year
$
690,236,419

 
$
567,592,950

Advance paid for vessel purchase
2,201,773

 
1,926,886

Purchase of Vessels and vessel improvements
41,487,795

 
174,400,746

Disposal of Vessels
(10,354,855
)
 
(15,218,633
)
Reclassification to vessels held for sale
(8,458,444
)
 
(9,316,095
)
Depreciation Expense
(32,167,752
)
 
(29,149,435
)
Vessels and Vessel Improvements
$
682,944,936

 
$
690,236,419