CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Revenues:
Total revenues	$ 6,807	$ 5,086	$ 11,001	$ 8,273
Cost of sales:
Total cost of sales	4,583	3,069	8,234	5,772
Gross profit	2,224	2,017	2,767	2,501
Operating expenses:
Selling, general and administrative	3,378	2,988	7,195	5,942
Research and development	888	755	1,741	1,165
Impairment of intangible assets	0	0	0	2,531
Depreciation and amortization	557	700	1,223	1,430
Total operating expenses	4,823	4,443	10,159	11,068
Operating loss	(2,599)	(2,426)	(7,392)	(8,567)
Other income:
Other, net	57	0	1,004	56
Total other income	57	0	1,004	56
Loss from continuing operations before income taxes	(2,542)	(2,426)	(6,388)	(8,511)
(Provision) benefit for income taxes	(197)	530	(52)	188
Loss from continuing operations	(2,739)	(1,896)	(6,440)	(8,323)
Income (loss) from discontinued operations, net of income taxes	79	(4,708)	(204)	(4,923)
Net loss	(2,660)	(6,604)	(6,644)	(13,246)
Preferred stock dividends	(682)	(559)	(1,266)	(1,118)
Net loss attributable to common stockholders	(3,342)	(7,163)	(7,910)	(14,364)
Net loss attributable to common stockholders	$ (3,342)	$ (7,163)	$ (7,910)	$ (14,364)
Net loss per common share - Basic
Continuing operations (in usd per share)	$ (0.25)	$ (0.20)	$ (0.56)	$ (0.78)
Discontinued operations (in usd per share)	0.01	(0.39)	(0.01)	(0.40)
Net loss (in usd per share)	(0.24)	(0.59)	(0.57)	(1.18)
Net loss per common share - Diluted
Continuing operations (in usd per share)	(0.25)	(0.20)	(0.56)	(0.78)
Discontinued operations (in usd per share)	0.01	(0.39)	(0.01)	(0.40)
Net loss (in usd per share)	$ (0.24)	$ (0.59)	$ (0.57)	$ (1.18)
Shares used in computing net loss per common share:
Basic (in shares)	13,774	12,182	13,767	12,177
Diluted (in shares)	13,774	12,182	13,767	12,177
Revenue from Contract with Customer, Product and Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost, Product and Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember