Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Employee and Director Benefits (Tables)

v3.8.0.1
Note 6 - Employee and Director Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    2018   2017
Expected volatility    
23.43
 %    
29.00
 %
Expected dividends    
1.07
 %    
0.43
 %
Expected term (in years)    
6
      
6
  
Risk-free rate    
2.67
 %    
2.08
 %
Share-based Compensation, Stock Options, Activity [Table Text Block]
            Weighted    
   
 
  
Weighted
  
Average
  
 
   
 
  
Average
  
Remaining
  
 
   
 
  
Exercise
  
Contractual
  
Aggregate
   
Shares
  
Price
  
Term (years)
  
Intrinsic Value
                             
(In Thousands)
  
Three Months Ended March 31, 2018:                                
Outstanding at January 1, 2018    
1,666,834
 
   $
10.68
 
    
5.5
 
   $
51,377
 
Granted    
10,250
 
    
41.21
 
    
9.9
 
    
(4
)
Exercised    
(173,836
)
    
4.90
 
    
3.4
 
    
6,244
 
Forfeited    
(1,000
)
    
25.41
 
    
8.5
 
    
15
 
Outstanding at March 31, 2018    
1,502,248
 
    
11.54
 
    
5.5
 
   $
43,978
 
                                 
Exercisable at March 31, 2018    
672,600
 
   $
5.48
 
    
3.9
 
   $
23,770
 
                                 
Three Months Ended March 31, 2017:                                
Outstanding at January 1, 2017    
2,026,334
 
   $
9.00
 
    
6.2
 
   $
57,636
 
Granted    
51,500
 
    
38.10
 
    
9.8
 
    
(89
)
Exercised    
(175,500
)
    
5.28
 
    
5.0
 
    
5,459
 
Forfeited    
(27,000
)
    
21.55
 
    
8.8
 
    
401
 
Outstanding at March 31, 2017    
1,875,334
 
    
9.96
 
    
6.2
 
   $
49,540
 
                                 
Exercisable at March 31, 2017    
928,236
 
   $
5.12
 
    
4.6
 
   $
29,013