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Note 7 - Share-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Number of shares
    
Weighted average
exercise price
  
                 
Options outstanding at beginning of year
    
764,430
     $
8.78
  
Granted
    
—
      
—
  
Less:
                
Exercised
    
—
      
—
  
Forfeited prior to vesting
    
(18,012
)
    
10.84
  
Canceled or expired
    
(1,482
)
    
11.00
  
Options outstanding at March 31, 2018
    
744,936
      
8.72
  
Options exercisable at end of March 31, 2018
    
550,509
     $
8.02
  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
   
Three months ended March 31,
  
   
201
8
    
201
7
  
Cost of goods sold
   $
5
     $
8
  
Sales and marketing
    
10
      
14
  
Research and product development
    
30
      
38
  
General and administrative
    
92
      
111
  
    $
137
     $
171