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Revenues (Tables)
12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Summary of Analysis of Consolidated Statements of Operations The amounts in the accompanying consolidated statements of operations are analyzed as follows:
    
Year ended December 31,
 
    
2018
    
2019
    
2020
 
Time charter revenues
     104,099,818        97,249,537        101,837,425  
Bareboat revenues
     24,646,311        21,764,102        16,876,956  
Voyage charter revenues
     34,266,082        24,018,198        25,161,401  
Other income
     1,317,991        1,227,475        1,127,239  
    
 
 
    
 
 
    
 
 
 
Total
  
 
164,330,202
 
  
 
144,259,312
 
  
 
145,003,021