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Note 15 - Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Year Ended December 31,
    2014   2015   2016
Numerator                        
Net income/(loss)    
12,685,826
      
2,566,678
      
(7,798,300
 )
Less: Undistributed earnings allocated to non-vested shares    
(26,357
 )    
(13,457
 )    
—
  
                         
Net income/(loss) attributable to common shareholders, basic    
12,659,469
      
2,553,221
      
(7,798,300
 )
                         
Denominator                        
                         
Weighted average number of shares outstanding, basic and diluted    
39,305,644
      
41,315,127
      
39,824,038
  
                         
Earnings/(loss) per share, basic and diluted    
0.32
      
0.06
      
(0.20
 )