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Note 11 - Stock Option and Equity Incentive Plans (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Employee Service Share Based Compensation Allocation of Recognized Period Costs, By Award Type [Table Text Block]
    Years Ended December 31,
Share-based compensation related to:   2017   2016   2015
Common stock grants   $
505
    $
505
    $
513
 
Stock option grants    
138
     
237
     
282
 
Restricted Stock Unit awards    
425
     
314
     
274
 
Total share-based compensation   $
1,068
    $
1,056
    $
1,069
 
Share-based Compensation, Stock Options, Activity [Table Text Block]
    Shares Under
Options
 
Weighted
Average
Exercise
Price

(per share)
 
Weighted
Average
Remaining
Contractual
Life

(in years)
 
Aggregate
Intrinsic
Value

(in thousands)
                 
Outstanding December 31, 2016    
232,578
    $
16.53
     
 
 
Granted    
27,336
     
27.96
     
 
     
 
Exercised    
(53,785
)    
27.09
     
 
     
 
 
Cancelled or expired    
(3,750
)    
18.85
     
 
     
 
 
Outstanding December 31, 2017    
202,379
    $
18.23
     
3.46
    $
1,950
 
Exercisable at December 31, 2017    
186,129
    $
17.43
     
3.42
    $
1,933
 
Vested and expected to vest at December 31, 2017    
202,379
    $
18.23
     
3.46
    $
1,950
 
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
    Restricted
Stock Units
  Weighted
Average Award
Date Fair Value
Outstanding at December 31, 2016    
46,558
    $
20.05
 
Awarded    
24,256
     
24.87
 
Shares vested    
(13,419
)    
23.54
 
Outstanding at December 31, 2017    
57,395
    $
21.03
 
Schedule of Future Share-based Compensation Expense [Table Text Block]
    Options   Common
Stock
  Restricted
Stock Units
  Total
2018    
44
     
-
     
370
     
414
 
2019    
28
     
-
     
274
     
302
 
2020    
28
     
-
     
187
     
215
 
2021    
-
     
-
     
21
     
21
 
Total    
100
     
-
     
852
     
952