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Note 6 - Share-based Compensation (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended March 31,
 
   
2017
   
2016
 
Stock options and SARS
  $
665,000
    $
752,000
 
Restricted stock
   
134,000
     
107,000
 
Performance shares
   
43,000
     
18,000
 
Total share-based compensation expense
  $
842,000
    $
877,000
 
                 
Related income tax benefit
  $
334,000
    $
119,000
 
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
   
90,012
     
16.97
 
Exercised
   
(56,124
)    
7.22
 
Lapsed
   
-
     
-
 
Cancelled
   
-
     
-
 
Outstanding March 31, 2017
   
859,139
    $
11.35
 
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
   
74,166
     
2.69
    $
4.75
 
$5.65
-
$7.36
   
341,057
     
1.92
    $
6.58
 
$7.96
-
$10.38
   
61,700
     
4.49
    $
9.28
 
$16.35
-
$18.66
   
382,216
     
4.75
    $
17.22
 
                             
$3.82
-
$18.66
   
859,139
     
3.43
    $
11.35
 
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
   
(59,364
)    
5.72
 
 
Lapsed
   
-
     
-
 
 
Cancelled
   
-
     
-
 
Outstanding March 31, 2017
   
310,130
    $
12.08
 
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
   
154,742
     
1.40
    $
6.81
 
$16.35
-
$18.66
   
155,388
     
3.51
    $
17.32
 
                             
$5.65
-
$18.66
   
310,130
     
2.46
    $
12.08
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Three months ended
           
March 31,
 
SARS
   
Options
 
             
Exercise price
           
2017
 
$16.97
   
$16.97
 
2016
 
16.35
   
16.35
 
             
Market price
           
2017
 
$16.97
   
$16.97
 
2016
 
16.35
   
16.35
 
             
Risk free interest rate
1
           
2017
 
1.9%
   
1.9%
 
2016
 
1.3%
   
1.3%
 
             
Expected award life (years)
2
 
5
   
5
 
             
Expected volatility
3
           
2017
 
36.6%
   
36.6%
 
2016
 
36.5%
   
36.5%
 
             
Expected dividend yield
4
           
2017
 
2.1%
   
2.1%
 
2016
 
2.0%
   
2.0%
 
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
   
No. of
   
Weighted Average
 
   
Shares
   
Grant Date Fair Value
 
Outstanding December 31, 2016
   
123,688
    $
8.94
 
Granted
   
34,619
     
16.97
 
Vested
   
(100,000
)    
7.36
 
Forfeited
   
-
     
-
 
Outstanding March 31, 2017
   
58,307
    $
16.42
 
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
   
No. of
   
Weighted Average
 
   
Shares
   
Grant Date Fair Value
 
Outstanding December 31, 2016
   
101,000
    $
16.36
 
Granted
   
37,392
     
16.97
 
Vested
   
-
     
-
 
Forfeited
   
-
     
-
 
Outstanding March 31, 2017
   
138,392
    $
16.53