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Accrued Liabilities
12 Months Ended
Dec. 31, 2021
Payables and Accruals [Abstract]  
Accrued Liabilities
8. Accrued Liabilities
The amounts shown in the accompanying consolidated balance sheets are analyzed as follows:
 
    
December 31,
 
    
2020
    
2021
 
Interest on long-term debt
     1,887,414        1,883,321  
Administrative expenses
     209,553        210,930  
Vessel operating and voyage expenses
     1,676,532        1,748,628  
    
 
 
    
 
 
 
Total
  
 
3,773,499
 
  
 
3,842,879