Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Employee and Director Benefits (Tables)

v3.10.0.1
Note 6 - Employee and Director Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    2018   2017
Expected volatility    
24.13
 %    
29.00
 %
Expected dividends    
1.06
 %    
0.44
 %
Expected term (in years)    
6.25
      
6.25
  
Risk-free rate    
2.67
 %    
2.09
 %
Share-based Compensation, Stock Options, Activity [Table Text Block]
            Weighted    
   
 
  
Weighted
  
Average
  
 
   
 
  
Average
  
Remaining
  
Aggregate
   
 
  
Exercise
  
Contractual
  
Intrinsic
   
Shares
  
Price
  
Term (years)
  
Value
                (In Thousands)
Six Months Ended June 30, 2018:                                
Outstanding at January 1, 2018    
1,666,834
 
   $
10.68
 
    
5.5
 
   $
51,377
 
Granted    
12,750
 
    
41.50
 
    
9.7
 
    
(9
)
Exercised    
(175,836
)
    
4.90
 
    
3.1
 
    
6,317
 
Forfeited    
(6,000
)
    
19.50
 
    
7.7
 
    
128
 
Outstanding at June 30, 2018    
1,497,748
 
    
11.58
 
    
5.3
 
   $
43,787
 
                                 
Exercisable at June 30, 2018    
748,600
 
   $
7.34
 
    
3.9
 
   $
25,811
 
                                 
Six Months Ended June 30, 2017:                                
Outstanding at January 1, 2017    
2,026,334
 
   $
9.00
 
    
6.2
 
   $
57,636
 
Granted    
51,500
 
    
37.95
 
    
9.6
 
    
(80
)
Exercised    
(292,000
)
    
4.98
 
    
4.4
 
    
9,169
 
Forfeited    
(32,000
)
    
21.96
 
    
8.6
 
    
(462
)
Outstanding at June 30, 2017    
1,753,834
 
    
10.28
 
    
5.9
 
   $
45,777
 
                                 
Exercisable at June 30, 2017    
811,736
 
   $
5.20
 
    
4.4
 
   $
25,303
 
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
    Shares   Weighted
Average Grant
Date Fair
Value
Six Months Ended June 30, 2018:                
Non-vested at January 1, 2018    
120,676
     $
10.29
  
Granted    
11,850
      
41.29
  
Vested    
(61,700
 )    
5.81
  
Forfeited    
-
      
-
  
Non-vested at June 30, 2018    
70,826
      
19.38
  
                 
Six Months Ended June 30, 2017:                
Non-vested at January 1, 2017    
118,676
     $
8.88
  
Granted    
6,000
      
38.16
  
Vested    
(4,200
 )    
14.49
  
Forfeited    
(800
 )    
15.74
  
Non-vested at June 30, 2017    
119,676
      
9.94