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Note 12 - Stock Awards (Tables)
3 Months Ended
Mar. 31, 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]
   
Three
Months Ended
 
   
March 31
, 2019
   
March 31
, 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
   
     
     
450
     
11.71
 
Options outstanding, end of period
   
444,100
    $
9.83
     
379,700
    $
9.80
 
Options exercisable, end of period
   
312,783
    $
9.25
     
248,300
    $
8.71