Selected Balance Sheet Information - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021
Accounts receivable, net:
Accounts receivable, net	$ 68,064	$ 48,669
Inventories, net:
Finished goods	12,535	7,684
In process	1,270	759
Materials	49,602	44,260
Inventories, net	63,407	52,703
Other current assets:
Income tax receivable	876	1,440
Prepaid Expense and other	7,028	4,336
Other Assets, Current	7,904	5,776
Property, plant and equipment, net:
Land	3,117	3,117
Buildings and Improvements	86,785	84,651
Machinery and Equipment	172,808	169,252
Financing Lease Right-of-Use Asset	1,245	1,282
Property, Plant and Equipment, Gross, Total	263,955	258,302
Accumulated depreciation	(156,050)	(152,295)
Property, Plant and Equipment, Net, Total	107,905	106,007
Other Assets (Noncurrent):
Equity investments	1,748	1,595
Operating Lease, Right-of-Use Asset	6,216	6,850
Deferred Income Taxes	352	360
Other	2,121	2,211
Other assets	10,437	11,016
Accrued liabilities:
Salaries and related	6,588	4,881
Benefits	6,508	6,255
Insurance obligations	1,746	1,896
Warranties	2,655	2,068
Income Taxes	1,406	238
Other taxes	1,838	2,386
Acquisition-related contingent consideration liability, current	2,000	2,000
Lease liability, current	2,135	2,482
Other	8,960	8,195
Accrued Liabilities	33,836	30,401
Other liabilities:
Postretirement benefits	8,999	8,996
Lease liability, noncurrent	4,989	5,426
Deferred Income Tax Liabilities, Net	2,264	2,091
Uncertain tax positions	2,759	2,692
Other, Noncurrent	4,826	4,792
Other Liabilities, Noncurrent	23,837	23,997
Allowance for uncollectable Account Receivable[Member]
Accounts receivable, net:
Trade accounts	63,788	47,879
Unbilled receivables	6,157	2,734
Allowance for doubtful accounts	(1,881)	(1,944)
Accounts receivable, net	$ 68,064	$ 48,669