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Note 8 - Discontinued Operations (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Disposal Groups, Including Discontinued Operations [Table Text Block]
    Six Months Ended June 30
(discontinued operations)
      2017       2018  
Statement of Operations Data                
Voyage revenue    
8,551,308
      
11,379,371
  
Commissions    
(489,434
 )    
(642,898
 )
Voyage expenses    
(930,971
 )    
(747,653
 )
Vessel operating expenses    
(3,661,567
 )    
(4,443,003
 )
Drydocking expenses    
(80,825
 )    
(1,442,657
 )
Management fees    
(660,983
 )    
(800,621
 )
Vessel depreciation    
(2,375,994
 )    
(2,531,778
 )
Other general and administrative expenses    
(486,577
 )    
(1,189,720
 )
Operating loss    
(135,043
 )    
(418,959
 )
Total other expenses, net    
(942,499
 )    
(921,838
 )
Net loss    
(1,077,542
 )    
(1,340,797
 )
Dividend Series B Preferred Shares    
-
      
(80,204
 )
Net loss attributable to discontinued operations    
(1,077,542
 )    
(1,421,001
 )
Loss per share attributable to common shareholders, basic and diluted    
(0.49
 )    
(0.64
 )
Weighted average number of shares outstanding during period, basic and diluted    
2,206,151
      
2,226,753