Segment Reporting - Financial Information by Business Segment (Revenues) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 7,613	$ 18,433
Operating income (loss)	(5,572)	(2,289)
Income (loss) before taxes	(5,468)	(2,436)
Operating Segments | Marine Technology Products
Segment Reporting Information [Line Items]
Revenues	3,708	6,911
Operating income (loss)	(2,374)	385
Income (loss) before taxes	(2,348)	113
Operating Segments | Equipment Leasing
Segment Reporting Information [Line Items]
Revenues	4,047	11,545
Operating income (loss)	(2,293)	(1,656)
Income (loss) before taxes	(2,215)	(1,519)
Corporate Expenses
Segment Reporting Information [Line Items]
Revenues	0	0
Operating income (loss)	(905)	(1,017)
Income (loss) before taxes	(905)	(1,017)
Eliminations
Segment Reporting Information [Line Items]
Revenues	(142)	(23)
Operating income (loss)	0	(1)
Income (loss) before taxes	$ 0	$ (13)