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4. Property, Plant and Equipment (Details) - Property, Plant and Equipment - USD ($)
$ in Thousands
6 Months Ended
Jul. 30, 2017
Jan. 29, 2017
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 57,089 $ 55,300
Less accumulated depreciation 33,154 31,167
Total depreciable property, net 23,935 24,133
Land 1,067 1,067
Construction-in-progress 505 603
Property, plant and equipment, net 25,507 25,803
Building and Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 24,015 23,392
Building and Building Improvements [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Depreciable Lives 15  
Building and Building Improvements [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Depreciable Lives 30  
Computer Software and Hardware [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 17,661 17,308
Computer Software and Hardware [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Depreciable Lives 3  
Computer Software and Hardware [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Depreciable Lives 10  
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 5,660 5,031
Property, Plant and Equipment, Depreciable Lives 10  
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 7,246 7,104
Property, Plant and Equipment, Depreciable Lives Term of lease  
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 1,946 1,903
Furniture and Fixtures [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Depreciable Lives 3  
Furniture and Fixtures [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Depreciable Lives 8  
Property, Plant and Equipment, Other Types [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 561 $ 562
Property, Plant and Equipment, Depreciable Lives 5