Selected Balance Sheet Information - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020
Accounts receivable, net:
Accounts receivable, net	$ 54,224	$ 62,552
Inventories, net:
Finished goods	5,992	6,309
In process	1,356	3,287
Materials	37,326	44,303
Inventories, net	44,674	53,899
Other current assets:
Insurance policy benefit	0	38
Income tax receivable	858	1,370
Prepaid Expense and other	4,080	4,028
Other Assets, Current	4,938	5,436
Property, plant and equipment, net:
Land	3,117	3,117
Buildings and Improvements	84,010	80,330
Machinery and Equipment	164,599	158,354
Financing Lease Right-of-Use Asset	1,207	881
Property, Plant and Equipment, Gross, Total	252,933	242,682
Accumulated depreciation	(148,337)	(141,832)
Property, Plant and Equipment, Net, Total	104,596	100,850
Other Assets (Noncurrent):
Equity investments	1,452	1,289
Operating Lease, Right-of-Use Asset	7,638	4,275
Deferred Income Taxes	65	16
Other	1,968	1,507
Other assets	11,123	7,087
Accrued liabilities:
Salaries and related	5,925	4,188
Benefits	5,888	5,339
Insurance obligations	1,935	1,680
Warranties	1,519	2,019
Income Taxes	279	293
Other taxes	1,843	1,734
Acquisition-related contingent consideration liability, current	0	763
Lease liability, current	2,490	2,530
Other	3,107	2,197
Accrued Liabilities	22,986	20,743
Other liabilities:
Postretirement benefits	8,787	8,741
Acquisition-related contingent consideration liability, long-term	2,254	2,171
Lease liability, noncurrent	5,936	2,627
Deferred Income Tax Liabilities, Net	2,460	7,080
Uncertain tax positions	2,618	2,606
Other, Noncurrent	10,889	5,936
Other Liabilities, Noncurrent	32,944	29,161
Allowance for uncollectable Account Receivable[Member]
Accounts receivable, net:
Trade accounts	53,099	56,978
Unbilled receivables	3,217	6,954
Allowance for doubtful accounts	(2,092)	(1,380)
Accounts receivable, net	$ 54,224	$ 62,552