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Note 15 - Earnings Per Share (EPS) (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    For the six-month periods ended
June 30,
    2016   2017
     
Basic EPS
     
Basic EPS
 
Net income   $
72,038
    $
46,063
 
Less: paid and accrued earnings allocated to Preferred Stock    
(10,473
)    
(10,473
)
Net income available to common stockholders    
61,565
     
35,590
 
Weighted average number of common shares, basic and diluted    
75,474,844
     
93,851,789
 
Earnings per common share, basic and diluted   $
0.82
    $
0.38