Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Revenues:
Sale of marine technology products	$ 5,877	$ 9,586	$ 9,443	$ 16,474
Equipment leasing	1,630	977	4,327	3,694
Sale of lease pool equipment	843	273	2,193	9,101
Total revenues	8,350	10,836	15,963	29,269
Cost of sales:
Sale of marine technology products	3,216	5,868	5,302	9,843
Equipment leasing (including lease pool depreciation of $2,445 and $3,750 for the three months ended July 31, 2018 and 2017 respectively, and $5,099 and $7,931 for the six months ended July 31, 2018 and 2017 respectively)	3,242	4,290	6,824	9,415
Lease pool equipment sales	32	60	732	6,199
Total cost of sales	6,490	10,218	12,858	25,457
Gross profit	1,860	618	3,105	3,812
Operating expenses:
Selling, general and administrative	5,504	4,825	11,134	9,629
Research and development	312	240	682	338
Provision for doubtful accounts	0	0	200	0
Depreciation and amortization	620	525	1,237	1,106
Total operating expenses	6,436	5,590	13,253	11,073
Operating loss	(4,576)	(4,972)	(10,148)	(7,261)
Other income (expense):
Interest income (expense), net	17	17	35	(29)
Other, net	55	(52)	141	(153)
Total other income (expense)	72	(35)	176	(182)
Loss before income taxes	(4,504)	(5,007)	(9,972)	(7,443)
Provision for income taxes	(85)	(357)	(522)	(586)
Net loss	(4,589)	(5,364)	(10,494)	(8,029)
Preferred stock dividends	(411)	(207)	(796)	(401)
Net loss attributable to common shareholders	$ (5,000)	$ (5,571)	$ (11,290)	$ (8,430)
Net loss per common share:
Basic (in usd per share)	$ (0.41)	$ (0.46)	$ (0.93)	$ (0.70)
Diluted (in usd per share)	$ (0.41)	$ (0.46)	$ (0.93)	$ (0.70)
Shares used in computing net loss per common share:
Basic (in shares)	12,093	12,082	12,090	12,080
Diluted (in shares)	12,093	12,082	12,090	12,080