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Vessels and vessel improvements (Tables)
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule Of Vessel And Vessel Improvements
The Vessel and vessel improvements activity for the years ended December 31, 2019 and 2018 is below:

 December 31, 2019December 31, 2018
Vessel and vessel improvements at the beginning of the year$682,944,936  $690,236,419  
Advance paid for vessel purchase2,040,000  2,201,773  
Purchase of vessels and vessel improvements143,477,720  41,487,795  
Sale of vessels(14,757,027) (10,354,855) 
Reclassification to vessels held for sale—  (8,458,444) 
Scrubbers and BWTS56,267,925  —  
Depreciation expense(34,014,470) (32,167,752) 
Vessels and vessel improvements at the end of the year$835,959,084  $682,944,936