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Note 11 - Stock Awards (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
2017
    
2016
  
Risk-free interest rate    
2.23
 %    
1.58
 %
Expected term  
7.5 years
    
7.5 years
  
Expected stock price volatility    
25.36
 %    
25.25
 %
Dividend yield    
1.50
 %    
1.50
 %
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Six
Months Ended
  
   
June 30
, 2017
    
June 30
, 2016
  
   
Number of
Shares
    
Average
Exercise
Price
    
Number of
Shares
    
Average
Exercise
Price
  
Options:
                                
Outstanding, beginning of period
    
272,550
     $
8.21
      
175,550
     $
8.17
  
Granted
    
68,600
      
13.91
      
97,000
      
8.30
  
Exercised
    
19,316
      
8.15
      
—
      
—
  
Expired
    
—
      
—
      
—
      
—
  
Forfeited
    
3,333
      
11.79
      
—
      
—
  
Options outstanding, end of period
    
318,501
     $
9.41
      
272,550
     $
8.21
  
Options exercisable, end of period
    
208,633
     $
8.20
      
175,550
     $
8.17