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Accrued Liabilities
12 Months Ended
Dec. 31, 2020
Payables and Accruals [Abstract]  
Accrued Liabilities
8. Accrued Liabilities
The amounts shown in the accompanying consolidated balance sheets are analyzed as follows:
 
    
December 31,
 
    
2019
    
2020
 
Interest on long-term debt
     2,790,621        1,887,414  
Administrative expenses
     205,184        209,553  
Vessel operating and voyage expenses
     3,006,274        1,676,532  
    
 
 
    
 
 
 
Total
  
 
6,002,079
 
  
 
3,773,499