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6. Property, Plant and Equipment (Details) - Property, Plant and Equipment - USD ($)
$ in Thousands
9 Months Ended
Oct. 29, 2017
Jan. 29, 2017
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 63,013 $ 55,300
Less accumulated depreciation 34,160 31,167
Total depreciable property, net 28,853 24,133
Land 1,067 1,067
Construction-in-progress 926 603
Property, plant and equipment, net 30,846 25,803
Building and Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 24,073 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 $ 18,181 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 $ 8,448 5,031
Property, Plant and Equipment, Depreciable Lives 10  
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 9,470 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 $ 2,181 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 $ 660 $ 562
Property, Plant and Equipment, Depreciable Lives 5