Note 1 - Business Information - Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Sales by product	$ 127,663	$ 128,965
Property, plant and equipment, net of accumulated depreciation	28,629	30,398
UNITED STATES
Sales by product	56,702	50,319
Property, plant and equipment, net of accumulated depreciation	9,063	10,279
CANADA
Sales by product	22,203	34,789
Property, plant and equipment, net of accumulated depreciation	11,554	11,862
Middle East [Member]
Sales by product	26,505	35,117
Property, plant and equipment, net of accumulated depreciation	7,815	8,103
Europe [Member]
Sales by product	17,462	1,029
INDIA
Sales by product	4,180	3,755
Property, plant and equipment, net of accumulated depreciation	197	154
Other Geographical Area [Member]
Sales by product	$ 611	$ 3,956