Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Revenues:
Total revenues	$ 6,541	$ 8,175	$ 14,814	$ 21,039
Cost of sales:
Total cost of sales	4,267	4,860	10,039	12,478
Gross profit	2,274	3,315	4,775	8,561
Operating expenses:
Selling, general and administrative	2,973	3,401	8,915	10,538
Research and development	912	629	2,077	1,442
Impairment of intangible assets	0	0	2,531	0
Depreciation and amortization	662	604	2,092	1,810
Total operating expenses	4,547	4,634	15,615	13,790
Operating loss	(2,273)	(1,319)	(10,840)	(5,229)
Other income (expense):
Other, net	12	(31)	68	145
Total other income (expense)	12	(31)	68	145
Loss from continuing operations before income taxes	(2,261)	(1,350)	(10,772)	(5,084)
(Provision) benefit for income taxes	(109)	31	79	75
Loss from continuing operations	(2,370)	(1,319)	(10,693)	(5,009)
Loss from discontinued operations, net of income taxes	(1,220)	(709)	(6,143)	(2,570)
Net loss	(3,590)	(2,028)	(16,836)	(7,579)
Preferred stock dividends	(559)	(522)	(1,677)	(1,492)
Net loss attributable to common shareholders	$ (4,149)	$ (2,550)	$ (18,513)	$ (9,071)
Net loss per common share - Basic
Continuing operations (in usd per share)	$ (0.24)	$ (0.15)	$ (1.01)	$ (0.54)
Discontinued operations (in usd per share)	(0.10)	(0.06)	(0.50)	(0.21)
Net loss (in usd per share)	(0.34)	(0.21)	(1.51)	(0.75)
Net loss per common share - Diluted
Continuing operations (in usd per share)	(0.24)	(0.15)	(1.01)	(0.54)
Discontinued operations (in usd per share)	(0.10)	(0.06)	(0.50)	(0.21)
Net loss (in usd per share)	$ (0.34)	$ (0.21)	$ (1.51)	$ (0.75)
Shares used in computing net loss per common share:
Basic (in shares)	12,313	12,158	12,223	12,135
Diluted (in shares)	12,313	12,158	12,223	12,135
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