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Note 12 - Stock Awards (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
2019
   
2018
 
Risk-free interest rate
   
2.59
%
   
2.77
%
Expected term (in years)
   
7.5
     
7.5
 
Expected stock price volatility
   
30.9
%
   
28.3
%
Dividend yield
   
1.25
%
   
1.50
%
Fair value of stock option
   
3.30
     
3.51
 
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
Six Months Ended
 
   
June 30, 2019
   
June 30, 2018
 
   
Number of
Shares
   
Average
Exercise
Price
   
Number of
Shares
   
Average
Exercise
Price
 
Options:
                               
Outstanding, beginning of period
   
377,950
   
$
9.80
     
318,000
   
$
9.43
 
Granted
   
66,150
     
10.01
     
62,150
     
11.71
 
Exercised
   
     
     
     
 
Expired
   
     
     
     
 
Forfeited
   
16,819
     
11.39
     
1,450
     
11.05
 
Options outstanding, end of period
   
427,281
   
$
9.77
     
378,700
   
$
9.80
 
Options exercisable, end of period
   
309,682
   
$
9.20
     
249,300
   
$
8.71