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Note 2 - Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Share-based Compensation, Activity [Table Text Block]
   
Awards
Available
  
Options
Outstanding
  
Weighted
Average
Exercise
Price
Balance December 31, 2017    
468
      
14,452
     $
6.06
  
Restricted stock unit awards granted    
(10
 )    
—
      
—
  
Restricted stock unit awards cancelled    
—
      
—
      
—
  
Stock option awards granted    
(222
 )    
222
      
6.00
  
Stock option awards exercised    
—
      
(372
 )    
2.68
  
Stock option awards cancelled    
93
      
(93
 )    
5.71
  
                         
Balance June 30, 2018    
329
      
14,209
     $
6.15
  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    2018
Expected Life in Years    
5.5
  
Expected Volatility    
82
 %
Expected Dividend Yield    
0.0
 %
Risk-Free Interest Rate    
2.7
 %