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Note 16 - Revenues
12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Revenue from Contract with Customer [Text Block]
16.
Revenues
 
The amounts in the accompanying consolidated statements of operations are analyzed as follows:
 
    Year ended December 31,
  2015   2016   2017
Time charter revenues    
68,834,267
     
83,211,819
     
97,195,215
 
Time charter revenues – related party    
9,814,000
     
7,592,784
     
1,973,643
 
Bareboat revenues    
32,977,819
     
29,422,512
     
27,647,268
 
Voyage charter revenues    
26,421,003
     
23,210,618
     
26,924,708
 
Ballast bonus    
300,000
     
50,000
     
160,000
 
Other income    
3,214,382
     
2,284,418
     
1,426,387
 
Off-hire    
(245,590
)    
(1,639,968
)    
(1,015,300
)
                         
Total    
141,315,881
     
144,132,183
     
154,311,921