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Segment Reporting - Financial Information by Business Segment (Revenues) (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 30, 2019 | Apr. 30, 2018
Segment Reporting Information [Line Items] |  |
Revenues | $ 9,857 | $ 7,613
Operating loss | (2,456) | (5,572)
Loss before taxes | (2,360) | (5,468)
Operating Segments | Marine Technology Products |  |
Segment Reporting Information [Line Items] |  |
Revenues | 5,982 | 3,708
Operating loss | (1,161) | (2,374)
Loss before taxes | (1,161) | (2,348)
Operating Segments | Equipment Leasing |  |
Segment Reporting Information [Line Items] |  |
Revenues | 3,935 | 4,047
Operating loss | (389) | (2,293)
Loss before taxes | (293) | (2,215)
Corporate expenses |  |
Segment Reporting Information [Line Items] |  |
Revenues | 0 | 0
Operating loss | (906) | (905)
Loss before taxes | (906) | (905)
Eliminations |  |
Segment Reporting Information [Line Items] |  |
Revenues | (60) | (142)
Operating loss | 0 | 0
Loss before taxes | $ 0 | $ 0

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