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Note 12 - Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
Shares
Under
Option
 
 
Weighted-
Average
Exercise Price
 
                 
Outstanding—January 1, 2014:
    
164,098
     $
10.99
  
Granted
    
-
      
-
  
Exercised
    
(77,708
 )    
10.88
  
Canceled
    
(42
 )    
11.22
  
                 
Outstanding—December 31, 2014:
    
86,348
     $
11.09
  
Granted
    
-
      
-
  
Exercised
    
(20,250
 )    
11.65
  
Canceled
    
-
      
-
  
                 
Outstanding—December 31, 2015:
    
66,098
     $
10.92
  
Granted
    
-
      
-
  
Exercised
    
(7,917
 )    
11.41
  
Canceled
    
(2,050
 )    
10.91
  
                 
Outstanding—December 31, 2016:
    
56,131
     $
10.85
  
                 
Options exercisable—December 31, 2016:
    
43,331
     $
10.84
  
Schedule of Share-based Compensation, Activity [Table Text Block]
 
 
Shares Under Option
 
 
Weighted- Average Exercise Price
 
 
Weighted- Average Remaining Contractual Term
 
 
Aggregate Intrinsic Value*
 
           
(per share)
    
(in years)
          
Outstanding at January 1, 2016
    
66,098
     $
10.92
      
 
      
 
  
Granted
    
-
      
-
      
 
      
 
  
Exercised
    
(7,917
 )    
11.41
      
 
      
 
  
Canceled/forfeited/expired
    
(2,050
 )    
10.91
      
 
      
 
  
Outstanding at December 31, 2016
    
56,131
     $
10.85
      
3.2
     $
849,026
  
                                 
Fully vested and
exercisable at December 31, 2016
    
43,331
     $
10.84
      
2.6
     $
656,002
  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
   
Stock Options
    
Restricted Stock
  
   
Number of Options
    
Weighted- Average Grant Date Fair Value
    
Number of Shares
    
Weighted- Average Grant Date Fair Value*
  
Nonvested at January 1, 2016
    
28,205
     $
6.07
      
5,700
     $
42.65
  
Granted
    
-
      
-
      
7,275
      
30.81
  
Canceled/forfeited/expired
    
(2,050
 )    
6.07
      
(450
 )    
42.65
  
Vested
    
(13,355
 )    
6.07
      
(5,475
 )    
35.02
  
Nonvested at December 31, 2016
    
12,800
     $
6.06
      
7,050
     $
36.35
  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
Exercise Price
 
 
Shares Under Outstanding Options
 
 
Weighted-Average Remaining Contractual Term
 
 
Shares Under Exercisable Options
 
               
(in years)
          
  $10.44      
15,000
      
1.2
      
15,000
  
  $10.90      
6,000
      
0.4
      
6,000
  
  $10.90      
25,600
      
5.4
      
12,800
  
  $11.22      
5,531
      
3.9
      
5,531
  
  $11.54      
4,000
      
0.2
      
4,000
  
         
56,131
      
3.2
      
43,331