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Note 1 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
(In thousands, except per share data)   2017   2016   2015
             
Net income available to common shareholders   $
92,940
    $
96,790
    $
74,107
 
                         
Average common shares outstanding    
69,385
     
61,291
     
56,168
 
Average potential dilutive common shares    
468
     
636
     
252
 
Average diluted common shares    
69,853
     
61,927
     
56,420
 
                         
Basic earnings per share   $
1.34
    $
1.58
    $
1.32
 
Diluted earnings per share   $
1.33
    $
1.56
    $
1.31