Segment Reporting - Financial Information by Business Segment (Revenues) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 10,663	$ 14,651	$ 29,418	$ 30,614
Operating (loss) income	(1,929)	(349)	(7,447)	(10,497)
(Loss) income before taxes	(1,968)	(5,440)	(7,416)	(15,412)
Operating Segments | Marine technology products
Segment Reporting Information [Line Items]
Revenues	8,065	9,305	20,792	19,025
Operating (loss) income	(227)	876	(2,106)	(2,515)
(Loss) income before taxes	(289)	881	(2,071)	(2,441)
Operating Segments | Equipment leasing
Segment Reporting Information [Line Items]
Revenues	2,622	5,386	8,732	11,906
Operating (loss) income	(745)	(347)	(2,685)	(5,369)
(Loss) income before taxes	(722)	(5,443)	(2,689)	(10,359)
Corporate expenses
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Operating (loss) income	(957)	(864)	(2,656)	(2,599)
(Loss) income before taxes	(957)	(864)	(2,656)	(2,599)
Eliminations
Segment Reporting Information [Line Items]
Revenues	(24)	(40)	(106)	(317)
Operating (loss) income	0	(14)	0	(14)
(Loss) income before taxes	$ 0	$ (14)	$ 0	$ (13)