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Note 2 - Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 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    
(6
 )    
—
      
—
  
Restricted stock unit awards cancelled    
—
      
—
      
—
  
Stock option awards granted    
(31
 )    
31
      
5.43
  
Stock option awards exercised    
—
      
(169
 )    
3.22
  
Stock option awards cancelled    
45
      
(45
 )    
5.87
  
                         
Balance March 31, 2018    
476
      
14,269
     $
6.10
  
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    
2.4
 %