Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Revenues:
Sale of marine technology products	$ 8,062	$ 9,277	$ 20,762	$ 18,720
Equipment leasing	2,305	3,166	7,002	7,493
Sale of lease pool and other equipment	296	2,208	1,654	4,401
Total revenues	10,663	14,651	29,418	30,614
Cost of sales:
Sale of marine technology products	4,728	4,904	12,070	10,206
Equipment leasing (including lease pool depreciation of $1,168 and $2,176 for the three months ended October 31, 2019 and 2018, respectively, and $3,757 and $7,275 for the nine months ended October 31, 2019 and 2018, respectively)	1,833	3,296	6,124	10,120
Equipment sales	51	1,227	550	1,959
Total cost of sales	6,612	9,427	18,744	22,285
Gross profit	4,051	5,224	10,674	8,329
Operating expenses:
Selling, general and administrative	4,705	4,819	14,732	15,953
Research and development	629	175	1,442	857
Provision for doubtful accounts	0	0	0	200
Depreciation and amortization	646	579	1,947	1,816
Total operating expenses	5,980	5,573	18,121	18,826
Operating loss	(1,929)	(349)	(7,447)	(10,497)
Other income (expense):
Loss on sale (including $5,355 of net cumulative translation loss)	0	(4,905)	0	(4,905)
Interest (expense) income, net	(12)	12	(34)	47
Other, net	(27)	(198)	65	(57)
Total other (expense) income	(39)	(5,091)	31	(4,915)
Loss before income taxes	(1,968)	(5,440)	(7,416)	(15,412)
(Provision) benefit for income taxes	(60)	249	(163)	(273)
Net loss	(2,028)	(5,191)	(7,579)	(15,685)
Preferred stock dividends	(522)	(449)	(1,492)	(1,245)
Net loss attributable to common shareholders	$ (2,550)	$ (5,640)	$ (9,071)	$ (16,930)
Net loss per common share:
Basic (in usd per share)	$ (0.21)	$ (0.47)	$ (0.75)	$ (1.40)
Diluted (in usd per share)	$ (0.21)	$ (0.47)	$ (0.75)	$ (1.40)
Shares used in computing net loss per common share:
Basic (in shares)	12,158	12,119	12,135	12,100
Diluted (in shares)	12,158	12,119	12,135	12,100