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Note 13 - Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Options
Outstanding
    
Weighted
Average
Exercise
Price
    
Aggregate
Intrinsic
Value(1)
    
Weighted
Average
Contractual
Term
(years)
  
Balance at December 31, 2017
    
187,000
     $
7.78
      
 
      
 
  
Granted
    
–
      
–
      
 
      
 
  
Exercised
    
(23,800
)
    
8.33
      
 
      
 
  
Expired
    
(31,500
)
    
10.79
      
 
      
 
  
Vested
    
(15,000
)
    
6.90
      
 
      
 
  
Balance at December 31, 2018
    
116,700
     $
6.90
     $
576,498
      
5.97
  
Exercisable at December 31, 2018
    
92,100
     $
6.90
     $
454,974
      
5.97
  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
   
2018
    
2017
  
   
Shares
    
Weighted-
Average
Grant Date
Fair Value
    
Shares
    
Weighted-
Average
Grant Date
Fair Value
  
Nonvested at beginning of year
    
32,087
     $
8.63
      
31,546
     $
7.03
  
Granted
    
22,649
      
11.32
      
13,258
      
10.24
  
Vested
    
(26,589
)
    
8.88
      
(11,920
)
    
6.18
  
Forfeited
    
–
      
–
      
(797
)
    
8.37
  
Nonvested at the end of the period
    
28,147
     $
10.56
      
32,087
     $
8.63