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Note 1 - Business Information - Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Net sales	$ 128,965	$ 105,248
Property, plant and equipment, net of accumulated depreciation	30,398	34,509
UNITED STATES
Net sales	50,319	42,648
Property, plant and equipment, net of accumulated depreciation	10,279	11,307
CANADA
Net sales	34,789	31,206
Property, plant and equipment, net of accumulated depreciation	11,862	13,868
Middle East [Member]
Net sales	35,117	26,322
Property, plant and equipment, net of accumulated depreciation	8,103	9,119
INDIA
Net sales	3,755	1,317
Property, plant and equipment, net of accumulated depreciation	154	215
Other Geographical Area [Member]
Net sales	$ 4,985	$ 3,755

X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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