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Note 16 - Voyage Expenses and Vessel Operating Expenses (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Voyage Expenses [Table Text Block]
    Year ended December 31,
Voyage Expenses   2014   2015   2016
Port expenses    
2,278,961
      
3,960,574
      
3,306,157
  
Bunkers    
7,553,318
      
8,566,490
      
6,117,326
  
Commissions    
3,725,645
      
4,112,177
      
4,259,812
  
Other voyage expenses    
529,587
      
936,297
      
1,706, 970 
  
                         
Total    
14,087,511
      
17,575,538
      
15,390,265
  
Vessel Operating Expenses [Table Text Block]
    Year ended December 31,
Vessels’ Operating Expenses   2014   2015   2016
Crew wages and related costs    
26,378,730
      
31,391,419
      
36,821,527
  
Insurance    
2,028,142
      
2,415,028
      
2,421,948
  
Repairs and maintenance    
5,194,476
      
5,091,916
      
5,724,148
  
Spares and consumable stores    
7,120,974
      
7,978,592
      
8,514,293
  
Miscellaneous expenses    
4,713,014
      
3,777,670
      
5,340,920
  
                         
Total    
45,435,336
      
50,654,625
      
58,822,836