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Note 6 - Share-based Compensation (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended June 30,
   
Six Months Ended June 30,
 
   
2017
   
2016
   
2017
   
2016
 
Stock options and SARS
  $
82,000
    $
81,000
    $
747,000
    $
833,000
 
Restricted stock
   
80,000
     
71,000
     
164,000
     
151,000
 
Performance shares
   
104,000
     
68,000
     
197,000
     
113,000
 
Total share-based compensation expense
  $
266,000
    $
220,000
    $
1,108,000
    $
1,097,000
 
                                 
Related income tax benefit
  $
58,000
    $
53,000
    $
168,000
    $
172,000
 
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
No. of
   
Weighted Average
 
   
Shares
   
Exercise Price
 
Outstanding December 31, 2016
   
825,251
    $
10.46
 
Granted
   
101,012
    $
17.09
 
Exercised
   
(205,330
)   $
8.08
 
Lapsed
   
-
    $
-
 
Cancelled
   
-
    $
-
 
Outstanding June 30, 2017
   
720,933
    $
12.06
 
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
-
$5.55
     
66,000
     
2.61
    $
4.79
 
  $5.65
-
$7.36
     
231,566
     
1.93
    $
6.55
 
  $7.96
-
$10.38
     
54,400
     
4.53
    $
9.13
 
  $16.35
-
$18.66
     
368,967
     
4.65
    $
17.25
 
                                 
  $3.82
-
$18.66
     
720,933
     
3.58
    $
12.06
 
Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block]
   
No. of
   
Weighted Average
 
   
Shares
   
Exercise Price
 
Outstanding December 31, 2016
   
325,506
    $
10.26
 
Granted
   
43,988
     
16.97
 
Exercised
   
(128,062
)    
6.87
 
Lapsed
   
-
     
-
 
Cancelled
   
-
     
-
 
Outstanding June 30, 2017
   
241,432
    $
13.28
 
Share-based Compensation, Activity [Table Text Block]
                   
Weighted Average
         
Range of
           
Remaining
   
Weighted Average
 
Exercise Price
   
Shares
   
Contractual Life (Years)
   
Exercise Price
 
  $5.65
-
$7.36
     
94,928
     
1.34
    $
6.95
 
  $16.35
-
$18.66
     
146,504
     
3.42
    $
17.38
 
                                 
  $5.65
-
$18.66
     
241,432
     
2.60
    $
13.28
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Three months ended
               
June 30,
 
SARS
   
Options
 
                 
Exercise price
               
2017
   
N/A
    $
18.05
 
2016
   
N/A
    $
18.55
 
                 
Market price
               
2017
   
N/A
    $
18.05
 
2016
   
N/A
    $
18.55
 
                 
Risk free interest rate
1
               
2017
   
N/A
     
2.4
%
2016
   
N/A
     
1.8
%
                 
Expected award life (years)
2
   
N/A
     
10
 
                 
Expected volatility
3
               
2017
   
N/A
     
41.4
%
2016
   
N/A
     
40.3
%
                 
Expected dividend yield
4
               
2017
   
N/A
     
1.9
%
2016
   
N/A
     
1.8
%
Six months ended
               
June 30,
 
SARS
   
Options
                 
Exercise price
               
2017
  $
16.97
   
$16.97
-
$18.05
2016
  $
16.35
   
$16.35
-
$18.55
                 
Market price
               
2017
  $
16.97
   
$16.97
-
$18.05
2016
  $
16.35
   
$16.35
-
$18.55
                 
Risk free interest rate
1
               
2017
   
1.9
%  
1.9%
-
2.4%
2016
   
1.3
%  
1.3%
-
1.8%
                 
Expected award life (years)
2
   
5
   
 5
-
10 
                 
Expected volatility
3
               
2017
   
36.6
%  
36.6%
-
41.4%
2016
   
36.5
%  
36.5%
-
40.3%
                 
Expected dividend yield
4
               
2017
   
2.1
%  
1.9%
2.1%
2016
   
2.0
%  
1.8%
-
2.0%
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
   
No. of
   
Weighted Average
 
   
Shares
   
Exercise Price
 
Outstanding December 31, 2016
   
123,688
    $
8.94
 
Granted
   
34,619
     
16.97
 
Vested
   
(100,000
)    
7.36
 
Forfeited
   
-
     
-
 
Outstanding June 30, 2017
   
58,307
    $
16.42
 
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
   
No. of
   
Weighted Average
 
   
Shares
   
Exercise Price
 
Outstanding December 31, 2016
   
101,000
    $
16.36
 
Granted
   
37,392
     
16.97
 
Vested
   
-
     
-
 
Forfeited
   
-
     
-
 
Outstanding June 30, 2017
   
138,392
    $
16.53