Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Revenues:
Total revenues	$ 4,194	$ 3,187
Cost of sales:
Total cost of sales	3,651	2,703
Gross profit	543	484
Operating expenses:
Selling, general and administrative	3,817	2,954
Research and development	853	410
Impairment of intangible assets	0	2,531
Depreciation and amortization	666	730
Total operating expenses	5,336	6,625
Operating loss	(4,793)	(6,141)
Other income:
Other, net	947	56
Total other income	947	56
Loss from continuing operations before income taxes	(3,846)	(6,085)
Benefit (provision) for income taxes	145	(342)
Loss from continuing operations	(3,701)	(6,427)
Loss from discontinued operations, net of income taxes	(283)	(215)
Net loss	(3,984)	(6,642)
Preferred stock dividends	(584)	(559)
Net loss attributable to common stockholders	$ (4,568)	$ (7,201)
Net loss per common share - Basic
Continuing operations (in usd per share)	$ (0.31)	$ (0.57)
Discontinued operations (in usd per share)	(0.02)	(0.02)
Net loss (in usd per share)	(0.33)	(0.59)
Net loss per common share - Diluted
Continuing operations (in usd per share)	(0.31)	(0.57)
Discontinued operations (in usd per share)	(0.02)	(0.02)
Net loss (in usd per share)	$ (0.33)	$ (0.59)
Shares used in computing net loss per common share:
Basic (in shares)	13,759	12,172
Diluted (in shares)	13,759	12,172
Revenue from Contract with Customer, Product and Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
Cost, Product and Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember