Note 2 - Significant Accounting Policies - Long-Lived Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2021	Jan. 31, 2020
Property, plant and equipment	$ 78,674	$ 77,816
Less accumulated depreciation	51,777	49,187
Property, plant and equipment, net of accumulated depreciation	26,897	28,629
Land, Buildings and Improvements [Member]
Property, plant and equipment	22,713	22,328
Machinery and Equipment [Member]
Property, plant and equipment	49,406	47,409
Furniture and Fixtures [Member]
Property, plant and equipment	3,830	4,317
Transportation Equipment [Member]
Property, plant and equipment	$ 2,725	$ 3,762