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Note 6 - Share-based Compensation (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended March 31,
 
   
(In thousands)
 
   
2018
   
2017
 
Stock options and SARS
  $
823
    $
665
 
Restricted stock
   
124
     
134
 
Performance shares
   
105
     
43
 
Total share-based compensation expense
  $
1,052
    $
842
 
                 
Related income tax benefit
  $
111
    $
334
 
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
No. of
   
Weighted Average
 
   
Shares
   
Exercise Price
 
Outstanding December 31, 2017
   
633,877
    $
13.33
 
Granted
   
87,385
     
23.59
 
Exercised
   
(38,908
)    
10.35
 
Lapsed
   
-
     
-
 
Cancelled
   
(700
)    
18.68
 
Outstanding March 31, 2018
   
681,654
    $
14.81
 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
               
Weighted Average
         
Range of
   
 
   
Remaining
   
Weighted Average
 
Exercise Price
 
Shares
   
Contractual Life (Years)
   
Exercise Price
 
$ 3.82
-
$ 5.88
   
102,800
     
2.93
    $
5.26
 
$ 7.36
-
$10.38
   
128,367
     
2.04
    $
7.88
 
$16.35
-
$18.66
   
316,017
     
3.40
    $
17.28
 
$21.63
-
$23.59
   
134,470
     
4.66
    $
22.90
 
                             
$3.82
-
$23.59
   
681,654
     
3.32
    $
14.81
 
Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block]
   
No. of
   
Weighted Average
 
   
Shares
   
Exercise Price
 
Outstanding December 31, 2017
   
146,504
    $
17.38
 
Granted
   
48,515
     
23.59
 
Exercised
   
(12,125
)    
17.92
 
Lapsed
   
-
     
-
 
Cancelled
   
-
     
-
 
Outstanding March 31, 2018
   
182,894
    $
18.99
 
Share-based Compensation, Activity [Table Text Block]
               
Weighted Average
         
Range of
   
 
   
Remaining
   
Weighted Average
 
Exercise Price
 
Shares
   
Contractual Life (Years)
   
Exercise Price
 
$16.35
-
$18.66
   
134,379
     
2.83
    $
17.33
 
$23.59
-
$23.59
   
48,515
     
4.83
    $
23.59
 
                             
$16.35
-
$23.59
   
182,894
     
3.36
    $
18.99
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Three months ended
               
March 31,
 
SARS
   
Options
 
                 
Exercise price
               
2018
  $
23.59
    $
23.59
 
2017
  $
16.97
    $
16.97
 
                 
Market price
               
2018
  $
23.59
    $
23.59
 
2017
  $
16.97
    $
16.97
 
                 
Risk free interest rate
1
               
2018
   
2.6
%    
2.6
%
2017
   
1.9
%    
1.9
%
                 
Expected award life (years)
2
               
2018
   
3
     
3
 
2017
   
5
     
5
 
                 
Expected volatility
3
               
2018
   
38.1
%    
38.1
%
2017
   
36.6
%    
36.6
%
                 
Expected dividend yield
4
               
2018
   
1.6
%    
1.6
%
2017
   
2.1
%    
2.1
%
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
           
Weighted Average
 
   
No. of
   
Grant Date
 
   
Shares
   
Fair Value
 
Outstanding December 31, 2017
   
61,378
    $
17.89
 
Granted
   
24,908
     
23.56
 
Vested
   
-
     
-
 
Forfeited
   
-
     
-
 
Outstanding March 31, 2018
   
86,286
    $
19.52
 
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
           
Weighted Average
 
   
No. of
   
Grant Date
 
   
Shares
   
Fair Value
 
Outstanding December 31, 2017
   
118,492
    $
17.24
 
Granted
   
2,778
     
26.99
 
Vested
   
-
     
-
 
Forfeited
   
-
     
-
 
Outstanding March 31, 2018
   
121,270
    $
17.46