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Note 13 - Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Net Funded Status [Table Text Block]
   
December 31,
 
   
2018
   
2017
 
(Amounts in thousands)
 
 
 
 
 
 
 
 
Beginning balance
  $
9,635
    $
9,181
 
Plan change
   
-
     
258
 
Service cost
   
245
     
231
 
Interest cost
   
358
     
372
 
Actuarial gain
   
(565
)    
(48
)
Benefits paid
   
(408
)    
(359
)
Ending balance
  $
9,265
    $
9,635
 
Schedule of Net Benefit Costs [Table Text Block]
   
Year Ended December 31,
   
   
2018
   
2017
   
2016
 
Income Statement Location
(Amounts in thousands)
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
  $
245
    $
231
    $
184
 
Salaries and employee benefits
Interest cost
   
358
     
372
     
382
 
Other expense
Amortization of prior service cost
   
228
     
228
     
226
 
Other expense
Amortization of losses
   
57
     
31
     
47
 
Other expense
Net periodic cost
  $
888
    $
862
    $
839
 
 
                           
Assumed discount rate
   
4.28
%    
3.85
%    
4.22
%
 
Schedule of Expected Benefit Payments [Table Text Block]
(Amounts in thousands)
 
 
 
 
2019
  $
478
 
2020
   
578
 
2021
   
635
 
2022
   
635
 
2023
   
634
 
2024 through 2028
   
3,391
 
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
     
Year Ended December 31,
 
     
2018
   
2017
   
2016
 
(Amounts in thousands)
 
 
 
 
 
 
 
 
 
 
 
 
Pre-tax compensation expense
  $
1,158
    $
790
    $
531
 
Excess tax benefit
   
95
     
17
     
174
 
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
 
 
 
 
Weighted Average
   
Weighted Average
   
Aggregate
 
   
Option
   
Exercise Price
   
Remaining Contractual
   
Intrinsic
 
(Amounts in thousands,
 
Shares
   
Per Share
   
Term (Years)
   
Value
 
except share and per share data)
                               
Outstanding, January 1, 2018
   
200,704
    $
20.14
     
 
     
 
 
Granted
   
-
     
-
     
 
     
 
 
Exercised
   
(24,186
)    
15.89
     
 
     
 
 
Canceled
   
(20,263
)    
19.72
     
 
     
 
 
Outstanding, December 31, 2018
   
156,255
    $
20.85
     
5.6
    $
1,662
 
Exercisable, December 31, 2018
   
103,090
    $
20.23
     
4.6
    $
1,160
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Year Ended December 31,
 
   
2017
   
2016
 
                 
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, 2018
   
43,606
    $
23.49
 
Granted
   
41,339
     
30.08
 
Vested
   
(33,832
)    
25.69
 
Canceled
   
-
     
-
 
Nonvested, December 31, 2018
   
51,113
    $
27.37