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Note 12 - Stock Option and Equity Incentive Plans (Tables)
12 Months Ended
Dec. 31, 2018
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:
  2018   2017   2016
Common stock grants   $
505
    $
505
    $
505
 
Stock option grants    
149
     
138
     
237
 
Restricted Stock Unit awards    
559
     
425
     
314
 
Total share-based compensation   $
1,213
    $
1,068
    $
1,056
 
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, 2017    
202,739
    $
18.23
     
 
     
 
 
Granted    
10,344
     
31.20
     
 
     
 
 
Exercised    
(78,680
)    
31.43
     
 
     
 
 
Outstanding December 31, 2018    
134,403
    $
20.46
     
4.50
    $
1,296
 
Exercisable at December 31, 2018    
126,543
    $
19.97
     
4.53
    $
1,286
 
Vested and expected to vest at December 31, 2018    
134,403
    $
20.46
     
4.50
    $
1,296
 
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, 2017    
57,395
    $
21.03
 
Awarded    
30,831
     
29.36
 
Shares vested    
(16,050
)    
23.55
 
Outstanding at December 31, 2018    
72,176
    $
23.60
 
Schedule of Future Share-based Compensation Expense [Table Text Block]
    Options   Common
Stock
  Restricted
Stock Units
  Total
2019   $
28
    $
-
    $
502
    $
530
 
2020    
28
     
-
     
416
     
444
 
2021    
-
     
-
     
250
     
250
 
2022    
-
     
-
     
30
     
30
 
Total   $
56
    $
-
    $
1,198
    $
1,254