Segment Reporting - Financial Information by Business Segment (Revenues) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 7,375	$ 9,857
Operating (loss) income	(6,180)	(2,456)
(Loss) income before taxes	(6,121)	(2,360)
Operating Segments | Marine technology products
Segment Reporting Information [Line Items]
Revenues	3,212	5,982
Operating (loss) income	(5,261)	(1,161)
(Loss) income before taxes	(5,230)	(1,161)
Operating Segments | Equipment leasing
Segment Reporting Information [Line Items]
Revenues	4,188	3,935
Operating (loss) income	(26)	(389)
(Loss) income before taxes	15	(293)
Corporate expenses
Segment Reporting Information [Line Items]
Revenues	0	0
Operating (loss) income	(880)	(906)
(Loss) income before taxes	(880)	(906)
Eliminations
Segment Reporting Information [Line Items]
Revenues	(25)	(60)
Operating (loss) income	(13)	0
(Loss) income before taxes	$ (26)	$ 0