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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

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