Balance Sheet Lease inform (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Feb. 01, 2019	Jan. 31, 2019
Lessee, Lease, Description [Line Items]
Operating Lease right-of-use asset	$ 4,275	$ 3,807	$ 0
Operating Lease, Liability, Current	2,272
Operating Lease, Liability, Noncurrent	2,370
Operating Lease, Liability, Total	4,642
Property, plant and equipment, net	100,850		$ 106,615
Finance Lease, Liability, Current	258
Finance Lease, Liability, Noncurrent	257
Finance Lease, Liability, Total	515
Right of Use Asset, Financing Lease [Member]
Lessee, Lease, Description [Line Items]
Property, plant and equipment, gross	881
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	366
Property, plant and equipment, net	$ 515