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Note 15 - Basic and Diluted Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year ended December 31,
  
   
201
7
    
201
6
    
201
5
  
Numerator:
  
 
 
 
  
 
 
 
  
 
 
 
                         
Net income
(loss)
   $
(3,003
 )   $
4,813
     $
1,562
  
                         
Denominator:
  
 
 
 
  
 
 
 
  
 
 
 
                         
Weighted average number of shares of common stock outstanding during the year used to compute basic net earnings
(loss) per share (in thousands)
    
22,229
      
21,800
      
21,924
  
Incremental shares attributable to exercise of outstanding options, SARs and RSUs (assuming proceeds would be used to purchase treasury stock) (in thousands)
    
-
      
1,087
      
1,416
  
                         
Weighted average number of shares of common stock used to compute diluted net earnings
(loss) per share (in thousands)
    
22,229
      
22,887
      
23,340
  
                         
Basic net earnings
(loss) per share
  $
(0.14
 )   $
0.22
     $
0.07
  
                         
Diluted net earnings
(loss) per share
  $
(0.14
 )   $
0.21
     $
0.07