Selected Balance Sheet Information - USD ($) $ in Thousands	Jul. 31, 2020	Jan. 31, 2020
Accounts receivable, net:
Trade accounts	$ 50,245	$ 56,978
Unbilled receivables	4,255	6,954
Allowance for doubtful accounts	(1,468)	(1,380)
Accounts receivable, net	53,032	62,552
Inventories, net:
Finished goods	7,582	6,309
In process	1,944	3,287
Materials	41,776	44,303
Inventories, net	51,302	53,899
Other current assets:
Insurance policy benefit	38	38
Income tax receivable	1,380	1,370
Prepaid Expense and other	4,396	4,028
Other Assets, Current	5,814	5,436
Property, plant and equipment, net:
Property, plant and equipment, net	104,937	100,850
Other Assets (Noncurrent):
Equity investments	1,404	1,289
Operating Lease, Right-of-Use Asset	7,729	4,275
Deferred Income Taxes	91	16
Other	1,777	1,507
Other assets	11,001	7,087
Accrued liabilities:
Salaries and related	2,742	4,188
Benefits	5,867	5,339
Insurance obligations	1,822	1,680
Warranties	1,609	2,019
Income Taxes	697	293
Other taxes	2,555	1,734
Acquisition-related contingent consideration liability, current	233	763
Lease liability, current	2,327	2,530
Other	2,570	2,197
Accrued Liabilities	20,422	20,743
Other liabilities:
Postretirement benefits	8,772	8,741
Acquisition-related contingent consideration liability, long-term	2,226	2,171
Lease liability, noncurrent	6,137	2,627
Deferred Income Tax Liabilities, Net	3,642	7,080
Uncertain tax positions	2,614	2,606
Other, Noncurrent	9,062	5,936
Other Liabilities, Noncurrent	32,453	29,161
Land [Member]
Property, plant and equipment, net:
Property, plant and equipment	3,117	3,117
Building and Building Improvements [Member]
Property, plant and equipment, net:
Property, plant and equipment	83,134	80,330
Machinery and Equipment [Member]
Property, plant and equipment, net:
Property, plant and equipment	166,162	158,354
Right-of-use Assets, Financing Leases [Member]
Property, plant and equipment, net:
Property, plant and equipment	1,071	881
Property, plant and equipment, Owned and Right-of-Use Assets for financing lease [Member]
Property, plant and equipment, net:
Accumulated depreciation	(148,547)	(141,832)
Property, plant and equipment, net	$ 104,937	$ 100,850