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Note 14 - Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Shares
Under
Option
    
Weighted-
Average
Exercise Price
  
                 
Outstanding—January 1, 2016:
    
66,098
     $
10.92
  
Granted
    
-
      
-
  
Exercised
    
(7,917
 )    
11.41
  
Canceled
    
(2,050
 )    
10.91
  
                 
Outstanding—December 31, 2016:
    
56,131
     $
10.85
  
Granted
    
-
      
-
  
Exercised
    
(11,063
 )    
11.13
  
Canceled
    
-
      
-
  
                 
Outstanding—December 31, 2017:
    
45,068
     $
10.79
  
Granted
    
-
      
-
  
Exercised
    
(45,005
 )    
10.79
  
Canceled
    
(63
 )    
10.90
  
                 
Outstanding—December 31, 2018:
    
-
     $
-
  
                 
Options exercisable—December 31, 2018:
    
-
     $
-
  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
   
Restricted Stock
  
   
Number of
Shares
    
Weighted-
Average Grant
Date Fair
Value
  
Nonvested at January 1, 2018
    
104,150
     $
17.14
  
Granted
    
34,932
      
36.35
  
Canceled/forfeited/expired
    
(150
 )    
42.65
  
Vested
    
(38,015
 )    
18.91
  
Nonvested at December 31, 2018
    
100,917
     $
23.09