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Note 8 - Earnings Per Share (Tables)
 9 Months Ended
Oct. 28, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Nine
Months Ended
  
   
October 28
,
201
7
    
October 29
,
201
6
    
October 2
8
,
201
7
    
October 29
,
201
6
  
Numerator:
                                
Net
(loss) income, as reported
   $
(19,084
)
   $
221
     $
(46,620
)
   $
(9,599
)
Denominator:
                                
Weighted-average common shares outstanding - basic
    
38,632
      
37,666
      
38,359
      
37,241
  
Dilutive effect of employee stock plans
    
-
      
335
      
-
      
-
  
Weighted-average common shares outstanding - diluted
    
38,632
      
38,001
      
38,359
      
37,241
  
Net
(loss) income per share - basic
   $
(0.49
)
   $
0.01
     $
(1.22
)
   $
(0.26
)
Net
(loss) income per share - diluted
   $
(0.49
)
   $
0.01
     $
(1.22
)
   $
(0.26
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months Ended
    
Nine
Months Ended
  
   
October 28
,
2017
    
October 29,
2016
    
October 2
8
,
2017
    
October 29,
2016
  
Stock options
    
2,286
      
2,205
      
2,360
      
2,421
  
Restricted stock units and awards
    
423
      
114
      
403
      
442