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Note 13 - Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Net Funded Status [Table Text Block]
   
December 31,
 
   
2017
   
2016
 
(Amounts in thousands)
 
 
 
 
 
 
 
 
Beginning balance
  $
9,181
    $
8,390
 
Plan change
   
258
     
69
 
Service cost
   
231
     
184
 
Interest cost
   
372
     
382
 
Actuarial (gain) loss
   
(48
)    
367
 
Benefits paid
   
(359
)    
(211
)
Ending balance
  $
9,635
    $
9,181
 
Schedule of Net Benefit Costs [Table Text Block]
   
Year Ended December 31,
 
 
 
2017
   
2016
   
2015
 
(Amounts in thousands, except discount rate)
                       
Service cost
  $
231
    $
184
    $
180
 
Interest cost
   
372
     
382
     
334
 
Amortization of prior service cost
   
228
     
226
     
260
 
Amortization of losses
   
31
     
47
     
66
 
Net periodic cost
  $
862
    $
839
    $
840
 
                         
Assumed discount rate
   
3.85
%    
4.22
%    
4.62
%
Schedule of Expected Benefit Payments [Table Text Block]
(Amounts in thousands)
       
2018
  $
468
 
2019
   
462
 
2020
   
529
 
2021
   
581
 
2022
   
586
 
2023 through 2027
   
2,924
 
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Year Ended December 31,
 
 
 
2017
   
2016
   
2015
 
(Amounts in thousands)
                       
Pre-tax compensation expense
  $
430
    $
209
    $
110
 
Excess tax benefit
   
17
     
174
     
8
 
Share-based Compensation, Stock Options, Activity [Table Text Block]
           
Weighted Average
   
Weighted Average
   
Aggregate
 
 
 
Option
   
Exercise Price
   
Remaining Contractual
   
Intrinsic
 
(Amounts in thousands,
except share and per share data)
 
Shares
   
Per Share
   
Term (Years)
   
Value
 
Outstanding, January 1, 2017
   
200,396
    $
19.73
     
 
     
 
 
Granted
   
22,849
     
24.72
     
 
     
 
 
Exercised
   
(16,185
)    
23.33
     
 
     
 
 
Canceled
   
(6,356
)    
15.83
     
 
     
 
 
Outstanding, December 31, 2017
   
200,704
    $
20.14
     
5.9
    $
1,742
 
Exercisable, December 31, 2017
   
145,536
    $
19.41
     
4.9
    $
1,373
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Year Ended December 31,
 
 
 
2017
   
2016
   
2015
 
                         
Stock options granted
   
22,849
     
32,768
     
-
 
Grant-date fair value per share
  $
5.79
    $
4.01
     
-
 
Volatility
   
27.86
%    
25.04
%    
-
 
Risk-free rate
   
2.17
%    
1.56
%    
-
 
Expected dividend yield
   
2.99
%    
3.09
%    
-
 
Expected term (in years)
   
6.50
     
6.50
     
-
 
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
           
Weighted Average
 
 
 
Shares
   
Grant-Date Fair Value
 
                 
Nonvested, January 1, 2017
   
27,803
    $
20.59
 
Granted
   
38,500
     
25.69
 
Vested
   
(22,697
)    
23.66
 
Canceled
   
-
     
-
 
Nonvested, December 31, 2017
   
43,606
    $
23.49