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Note 14 - Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2012
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
   
Year Ended December 31,
 
   
2010
   
2011
   
2012
 
                   
Numerator
                 
Net income
    11,093,191       8,549,791       28,958,487  
Less: Dividends declared and undistributed earnings allocated to non-vested shares
    (16,469 )           (11,220 )
Net income attributable to common shareholders, basic
    11,076,722       8,549,791       28,947,267  
                         
Denominator
                       
Weighted average number of shares outstanding, basic and diluted
    21,539,331       20,909,154       20,552,568  
Earnings per share, basic and diluted
    0.51       0.41       1.41