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Note 6 - Vessels, Net (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    Vessel cost   Accumulated
Depreciation		   Net Book
Value
Balance, December 31, 2014    
895,387,989
      
(184,035,144
 )    
711,352,845
  
Acquisitions (transfer from Advances for Vessels under Construction and Acquisitions)    
200,159,411
      
—
      
200,159,411
  
Disposals    
(1,977,051
 )    
—
      
(1,977,051
 )
Impairment loss    
(26,190,677
 )    
17,951,690
      
(8,238,987
 )
Vessel held for sale    
(748,823
 )    
—
      
(748,823
 )
Depreciation for the year    
—
      
(35,857,507
 )    
(35,857,507
 )
                         
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
  
Impairment loss    
(34,859,054
 )    
29,123,968
      
(5,735,086
 )
Disposal    
(591,137
 )    
—
      
(591,137
 )
Depreciation for the year    
—
      
(39,096,589
 )    
(39,096,589
 )
                         
Balance, December 31, 2016    
1,075,613,321
      
(211,913,582
 )    
863,699,739