4. Property, Plant and Equipment (Details) - Property, Plant and Equipment - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Jan. 29, 2017
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 55,567	$ 55,300
Less accumulated depreciation	32,182	31,167
Total depreciable property, net	23,385	24,133
Land	1,067	1,067
Construction-in-progress	1,251	603
Property, plant and equipment, net	25,703	25,803
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 23,392	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	$ 17,504	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	$ 5,067	5,031
Property, Plant and Equipment, Depreciable Lives	10
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 7,104	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	$ 1,938	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	$ 562	$ 562
Property, Plant and Equipment, Depreciable Lives	5