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Note 2 - Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
(In thousands, except per share data)
 
2013
   
2012
   
2013
   
2012
 
Net income
 
$
6,576
   
$
6,536
   
$
12,513
   
$
12,891
 
                                 
Average common shares outstanding
   
16,415
     
17,044
     
16,465
     
17,130
 
Average potential dilutive common shares
   
3
     
5
     
4
     
4
 
Average diluted common shares
   
16,418
     
17,049
     
16,469
     
17,134
 
                                 
Basic earnings per share
 
$
0.40
   
$
0.38
   
$
0.76
   
$
0.75
 
Diluted earnings per share
 
$
0.40
   
$
0.38
   
$
0.76
   
$
0.75