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Note 15 - Stock Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Share-based Compensation, Activity [Table Text Block]
   
Three Months Ended
 
 
Nine Months Ended
 
 
 
September 30,
 
 
September 30,
 
 
 
2016
 
 
2015
 
 
2016
 
 
2015
  
   
(Dollars in thousands)
  
Stock option grant expense
 
$
328
 
 
$
3,544
 
 
$
5,621
 
 
$
5,043
 
Restricted stock awards expense
 
 
145
 
 
 
454
 
 
 
1,015
 
 
 
1,546
 
Total stock based compensation
 
$
473
 
 
$
3,998
 
 
$
6,636
 
 
$
6,589