Segment Reporting - Financial Information by Business Segment (Assets) (Detail) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Segment Reporting Information [Line Items]
Fixed assets, net	$ 13,777	$ 14,155	$ 22,900
Intangible assets, net	8,161	10,495	8,015
Goodwill	2,531	2,531	2,531
Total Assets	58,228	65,301	73,679
Marine Technology Products
Segment Reporting Information [Line Items]
Fixed assets, net	4,791	4,635	3,790
Intangible assets, net	8,048	10,417	8,015
Goodwill	2,531	2,531	2,531
Total Assets	47,211	44,832	35,879
Equipment Leasing
Segment Reporting Information [Line Items]
Fixed assets, net	8,986	9,534	19,161
Intangible assets, net	113	78	0
Goodwill	0	0	0
Total Assets	$ 11,017	$ 20,469	$ 37,850

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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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