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Note 16 - Segment and Geographical Information (Tables)
 12 Months Ended
Feb. 03, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Fiscal Years Ended
  
   
February 3,
2018
    
January 28,
2017
    
January 30,
2016
  
                         
Connected Smart TV Platforms
   $
83,865
     $
175,085
     $
180,360
  
IoT Devices
    
53,406
      
45,159
      
46,792
  
License and Other
    
2,200
      
300
      
98
  
Less: Discontinued operations
    
(73,566
 )    
(86,137
 )    
(101,499
 )
Net revenue
   $
65,905
     $
134,407
     $
125,751
  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
Fiscal Years Ended
  
   
February 3,
2018
    
January 28,
2017
    
January 30,
2016
  
                         
Asia
   $
115,451
     $
180,104
     $
172,773
  
North America
    
15,476
      
32,732
      
42,335
  
Europe
    
8,544
      
7,692
      
10,292
  
Other regions
    
-
      
16
      
1,850
  
Less: Discontinued operations
    
(73,566
 )    
(86,137
 )    
(101,499
 )
Net revenue
   $
65,905
     $
134,407
     $
125,751
  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
February 3,
2018
    
January 28,
2017
  
                 
United States
   $
3,337
     $
11,923
  
Singapore
    
962
      
3,917
  
All other countries
    
1,879
      
2,683
  
Less: Assets held for sale
    
(1,839
 )    
(7,265
 )
Long-lived assets
  $
4,339
     $
11,258
  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   
Fiscal Years Ended
  
   
February 3,
2018
    
January 28,
2017
    
January 30,
2016
  
                         
Sunjet Components Corp
    
22
 %    
20
 %    
16
 %
Silicon Application
    
10
 %    
13
 %    
*
  
Arris Global
    
*
      
14
 %    
*
  
Geographic Concentration Risk [Member]  
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
Fiscal Years Ended
  
   
February 3,
2018
    
January 28,
2017
    
January 30,
2016
  
                         
China, including Hong Kong
   $
65,048
     $
110,195
     $
93,560
  
Taiwan
    
38,673
      
51,093
      
50,301
  
United States
    
13,892
      
32,367
      
41,781
  
Thailand
    
1,852
      
9,487
      
13,532
  
Rest of the world
    
20,006
      
17,402
      
28,076
  
Less: Discontinued operations
    
(73,566
 )    
(86,137
 )    
(101,499
 )
Net revenue
   $
65,905
     $
134,407
     $
125,751