Note 1 - Business Information - Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Net sales	$ 84,694	$ 127,663
Property, plant and equipment, net of accumulated depreciation	26,897	28,629
UNITED STATES
Net sales	42,527	56,702
Property, plant and equipment, net of accumulated depreciation	7,672	9,063
CANADA
Net sales	12,367	22,203
Property, plant and equipment, net of accumulated depreciation	10,592	11,554
Middle East [Member]
Net sales	23,662	26,505
Property, plant and equipment, net of accumulated depreciation	7,854	7,815
Europe [Member]
Net sales	118	17,462
INDIA
Net sales	1,942	4,180
Property, plant and equipment, net of accumulated depreciation	779	197
Other Geographical Area [Member]
Net sales	$ 4,078	$ 611