Note 7 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Property, plant and equipment	$ 77,816	$ 77,141
Accumulated depreciation and amortization	(49,187)	(46,743)
Property, plant and equipment, net of accumulated depreciation	28,629	30,398
Finance lease liability short-term	417
Finance lease liability long-term	677
Total finance lease liabilities	1,094
Operating Lease, Right-of-Use Asset	11,475
Operating lease liability short-term	1,040
Operating lease liability long-term	11,214
Total operating lease liabilities	12,254
Finance Leases Assets [Member]
Property, plant and equipment	1,696
Accumulated depreciation and amortization	(551)
Property, plant and equipment, net of accumulated depreciation	$ 1,145