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Accrued Liabilities (Tables)
 12 Months Ended
Dec. 31, 2019
Payables and Accruals [Abstract]  
Schedule of Accrued Liabilities
The amounts shown in the accompanying consolidated balance sheets are analyzed as follows:
 
   
December 31,
 
   
2018
   
2019
 
Interest on long-term debt
   3,656,811    2,790,621 
Administrative expenses
   251,257    205,184 
Other operating costs
   660,000    — 
Vessel operating and voyage expenses
   2,311,420    3,006,274 
  
 
 
   
 
 
 
Total
  
 
6,879,488
 
  
 
6,002,079