Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Revenues:
Total revenues	$ 5,086	$ 6,820	$ 8,273	$ 12,864
Cost of sales:
Total cost of sales	3,069	4,013	5,772	7,618
Gross profit	2,017	2,807	2,501	5,246
Operating expenses:
Selling, general and administrative	2,988	3,380	5,942	7,137
Research and development	755	498	1,165	813
Impairment of intangible assets	0	0	2,531	0
Depreciation and amortization	700	605	1,430	1,206
Total operating expenses	4,443	4,483	11,068	9,156
Operating loss	(2,426)	(1,676)	(8,567)	(3,910)
Other income (expense):
Other, net	0	136	56	176
Total other income	0	136	56	176
Loss from continuing operations before income taxes	(2,426)	(1,540)	(8,511)	(3,734)
Benefit for income taxes	530	46	188	44
Loss from continuing operations	(1,896)	(1,494)	(8,323)	(3,690)
Loss from discontinued operations, net of income taxes	(4,708)	(1,643)	(4,923)	(1,861)
Net loss	(6,604)	(3,137)	(13,246)	(5,551)
Preferred stock dividends	(559)	(499)	(1,118)	(970)
Net loss attributable to common shareholders	$ (7,163)	$ (3,636)	$ (14,364)	$ (6,521)
Net loss per common share - Basic
Continuing operations (in usd per share)	$ (0.20)	$ (0.16)	$ (0.78)	$ (0.39)
Discontinued operations (in usd per share)	(0.39)	(0.14)	(0.40)	(0.15)
Net loss (in usd per share)	(0.59)	(0.30)	(1.18)	(0.54)
Net loss per common share - Diluted
Continuing operations (in usd per share)	(0.20)	(0.16)	(0.78)	(0.39)
Discontinued operations (in usd per share)	(0.39)	(0.14)	(0.40)	(0.15)
Net loss (in usd per share)	$ (0.59)	$ (0.30)	$ (1.18)	$ (0.54)
Shares used in computing net loss per common share:
Basic (in shares)	12,182	12,128	12,177	12,124
Diluted (in shares)	12,182	12,128	12,177	12,124
Marine Technology Products
Revenues:
Total revenues	$ 5,086	$ 6,820	$ 8,273	$ 12,864
Cost of sales:
Total cost of sales	$ 3,069	$ 4,013	$ 5,772	$ 7,618