Selected Balance Sheet Information - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Accounts receivable, net:
Trade accounts	$ 56,894	$ 53,820
Unbilled receivables	6,421	1,391
Allowance for doubtful accounts	(1,258)	(739)
Accounts receivable, net	62,057	54,472
Inventories:
Finished goods	6,997	7,629
In process	1,268	1,103
Materials	43,716	45,344
Inventories	51,981	54,076
Other current assets:
Insurance policy benefit	73	336
Income tax receivable	1,624	1,045
Receivable from sale of investments	0	1,055
Prepaid Expense and other	3,398	6,300
Other current assets	5,095	8,736
Property, plant and equipment, net:
Property, plant and equipment, net	101,487	106,615
Other Assets (Noncurrent):
Equity investments	1,200	345
Operating Lease, Right-of-Use Asset	2,782	0
Deferred Income Taxes, Noncurrent	17	16
Other	4,796	2,963
Other assets	8,795	3,324
Accrued liabilities:
Salaries and related	4,884	8,244
Benefits	5,229	4,751
Insurance obligations	1,976	1,963
Warranties	1,984	890
Income Taxes	352	328
Other taxes	1,474	2,434
Acquisition-related contingent consideration liability, current	813	1,796
Lease liability, current	2,065	0
Other	2,129	3,072
Accrued liabilities	20,906	23,478
Other liabilities:
Postretirement benefits	7,703	7,678
Acquisition-related contingent consideration liability, long-term	2,143	2,376
Lease liability, noncurrent	1,776	0
Deferred income taxes	3,357	1,659
Uncertain tax positions	2,701	2,670
Other, Noncurrent	4,289	3,852
Other Liabilities, Noncurrent	21,969	18,235
Land [Member]
Property, plant and equipment, net:
Property, plant and equipment	3,117	3,234
Building and Building Improvements [Member]
Property, plant and equipment, net:
Property, plant and equipment	79,719	81,381
Machinery and Equipment [Member]
Property, plant and equipment, net:
Property, plant and equipment	156,530	155,463
Right-of-use Assets, Financing Leases [Member]
Property, plant and equipment, net:
Property, plant and equipment	879	0
Property, plant and equipment, Owned [Member]
Property, plant and equipment, net:
Accumulated depreciation		(133,724)
Property, plant and equipment, net		106,354
Property, plant and equipment, Owned and Right-of-Use Assets for financing lease [Member]
Property, plant and equipment, net:
Accumulated depreciation	(138,758)
Property, plant and equipment, net	101,487
Assets Held under Capital Leases [Member]
Property, plant and equipment, net:
Property, plant and equipment	0	510
Accumulated depreciation	$ 0	(249)
Assets owned or held under capital lease [Member]
Property, plant and equipment, net:
Property, plant and equipment, net		$ 106,615