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Note 3 - Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
          Weighted Average  
     
Weighted Average
  
Remaining
  
Aggregate
   
Number of
  
Exercise Price
  
Contractual Life
  
Intrinsic
   
Shares
  
Per Share
  
(in years)
  
Value
(1)
Outstanding, December 31, 2017    
279
 
   $
15.40
 
    
8.7
 
   $
1,436
 
Granted    
119
 
   $
21.01
 
    
 
 
    
 
 
Exercised    
-
 
    
 
 
    
 
 
    
 
 
Forfeited    
-
 
    
 
 
    
 
 
    
 
 
Outstanding, September 30, 2018    
398
 
   $
17.09
 
    
8.4
 
   $
956
 
                                 
Exercisable, September 30, 2018    
143
 
   $
14.51
 
    
7.8
 
   $
616
 
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
    Number
of Shares		   Weighted
Average Price
per Share
(2)
   Weighted
Average Fair
Value
(2)
             
Outstanding & Unvested, December 31, 2017    
33
     $
16.08
     $
516
  
Granted    
6
     $
21.04
     $
126
  
Converted to common stock    
(15
 )    
 
      
 
  
Cancelled    
(5
 )    
 
      
 
  
Forfeited    
-
      
 
      
 
  
Outstanding & Unvested, September 30, 2018    
19
     $
18.20
     $
343