Note 4 - Supplemental Financial Information
 3 Months Ended
Apr. 29, 2017
Notes to Financial Statements  
Supplemental Balance Sheet Disclosures [Text Block]
4.
             Supplemental financial information
 
Inventory consists of the following (in thousands):
 
 
 
April 29
, 201
7
 
 
January 28
, 201
7
 
Wafers and other purchased materials
   $
10,944
     $
8,595
  
Work-in-process
    
3,025
      
2,780
  
Finished goods
    
4,896
      
6,772
  
Total inventory
   $
18,865
     $
18,147
  
 
Prepaid expenses and other current assets consist of the following (in thousands):
 
 
 
April 29
, 201
7
 
 
January 28
, 201
7
 
Prepayments for taxes
   $
3,444
     $
3,421
  
Non-operating receivable
    
742
      
955
  
Prepayments for royalties
    
905
      
776
  
Other current assets
    
2,962
      
2,865
  
Total prepaid expenses and other current assets
   $
8,053
     $
8,017
  
 
Software, equipment and leasehold improvements consist of the following (in thousands, except for years):
 
 
 
Estimated Useful Lives
(
Y
ears)
 
 
April 29
, 201
7
 
 
January 28
, 201
7
 
Software
    
3
-
5
     $
49,999
     $
49,915
  
Mask sets
    
 
3
 
      
21,255
      
18,209
  
Equipment
    
 
3
 
      
8,021
      
7,719
  
Office equipment and furniture
    
3
-
5
      
7,918
      
7,857
  
Leasehold improvements
    
1
-
5
      
2,129
      
2,108
  
Total
    
 
 
 
      
89,322
      
85,808
  
Less: Accumulated depreciation and amortization
    
 
 
 
      
(69,942
)
    
(67,285
)
Total software, equipment and leasehold improvements, net
    
 
 
 
     $
19,380
     $
18,523
  
 
The table above includes, as of
April 29, 2017,
mask sets, net of amortization, of
$2.6
million, which represents our share of the cost incurred in connection with the collaborative arrangement discussed in Note
11.
 
Software, equipment and leasehold improvement depreciation and amortization expense for the
three
months ended
April 29, 2017
and
April 30, 2016
was
$2.7
million and
$3.4
million, respectively.
 
Accrued liabilities consist of the following (in thousands):
 
 
April 29
, 201
7
 
 
January 28
, 201
7
 
License fees
   $
4,669
     $
5,578
  
Income taxes payable, current portion
    
2,533
      
2,094
  
Rebates
    
1,852
      
1,585
  
Royalties
    
1,713
      
1,378
  
Warranty
    
727
      
783
  
Deferred revenue
    
460
      
350
  
Other accrued liabilities
    
3,409
      
1,839
  
Total accrued liabilities
   $
15,363
     $
13,607
  
 
The following table summarizes activity related to accrued rebates (in thousands):
 
 
 
Three
months ended
April 29, 2017
 
Beginning balance
   $
1,585
  
Charged as a reduction of revenue
    
725
  
Payments
   
(458
)
Ending balance
   $
1,852