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Note 3 - Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
      Number of
Shares		   Weighted Average
Exercise Price
Per Share		   Weighted Average
Remaining
Contractual Life		   Aggregate
Intrinsic
Value
(1)
  Outstanding, December 31, 2017      
279
     $
15.40
      
8.7 years
     $
1,436
  
  Granted      
117
     $
21.04
      
 
      
 
  
  Exercised      
-
      
 
      
 
      
 
  
  Forfeited      
-
      
 
      
 
      
 
  
  Outstanding, June 30, 2018      
396
     $
17.07
      
8.7 years
     $
1,068
  
                                     
  Exercisable, June 30, 2018      
133
     $
14.82
      
8.1 years
     $
590
  
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, June 30, 2018    
19
     $
18.20
     $
343