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Note 6 - Vessels, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Vessel cost
    
Accumulated
Depreciation
    
Net Book
Value
  
Balance, December 31, 2015    
1,066,630,849
      
(201,940,961
 )    
864,689,888
  
Acquisitions (transfer from Advances for Vessels under Construction and Acquisitions)    
44,432,663
      
—
      
44,432,663
  
Disposals    
(591,137
 )    
—
      
(591,137
 )
Impairment loss    
(34,859,054
 )    
29,123,968
      
(5,735,086
 )
Depreciation for the year    
—
      
(39,096,589
 )    
(39,096,589
 )
                         
Balance, December 31, 2016    
1,075,613,321
      
(211,913,582
 )    
863,699,739
  
Acquisitions (transfer from Advances for Vessels under Construction and Acquisitions)    
55,302,364
      
—
      
55,302,364
  
Impairment loss    
(29,222,564
 )    
22,761,291
      
(6,461,273
 )
Disposal    
(11,557,252
 )    
—
      
(11,557,252
 )
Depreciation for the year    
—
      
(38,921,672
 )    
(38,921,672
 )
                         
Balance, December 31, 2017    
1,090,135,869
      
(228,073,963
 )    
862,061,906