Note 6 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Property, plant and equipment	$ 78,674	$ 77,816
Accumulated depreciation and amortization	(51,777)	(49,187)
Property, plant and equipment, net of accumulated depreciation	26,897	28,629
Finance lease liability short-term	300	417
Finance lease liability long-term	401	677
Total finance lease liabilities	701	1,094
Operating Lease, Right-of-Use Asset	13,384	11,475
Operating lease liability short-term	1,402	1,040
Operating lease liability long-term	13,174	11,214
Total operating lease liabilities	14,576	12,254
Financing cash flows from finance leases	432	287
Operating cash flows from finance leases	69	58
Operating cash flows from operating leases	3,097	2,287
Finance leases liabilities
Operating leases liabilities	3,255
Finance Leases Assets [Member]
Property, plant and equipment	879	1,696
Accumulated depreciation and amortization	(96)	(551)
Property, plant and equipment, net of accumulated depreciation	$ 783	$ 1,145