Note 2 - Significant Accounting Policies - Long-Lived Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Property, plant and equipment	$ 79,223	$ 78,674
Less accumulated depreciation	54,467	51,777
Property, plant and equipment, net of accumulated depreciation	24,756	26,897
Land, Buildings and Improvements [Member]
Property, plant and equipment	22,748	22,713
Machinery and Equipment [Member]
Property, plant and equipment	50,534	49,406
Furniture and Fixtures [Member]
Property, plant and equipment	3,941	3,830
Transportation Equipment [Member]
Property, plant and equipment	$ 2,000	$ 2,725