Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Revenues:
Total revenues	$ 23,107	$ 21,215
Cost of sales:
Total cost of sales	17,085	13,906
Gross profit	6,022	7,309
Operating expenses:
Selling, general and administrative	14,761	12,648
Research and development	3,596	3,003
Provision for doubtful accounts	0	659
Impairment of intangible assets	0	2,531
Depreciation and amortization	2,209	2,796
Total operating expenses	20,566	21,637
Operating loss	(14,544)	(14,328)
Other income:
Other income, net	926	862
Total other income	926	862
Loss from continuing operations before income taxes	(13,618)	(13,466)
Benefit (provision) for income taxes	39	(536)
Loss from continuing operations	(13,579)	(14,002)
Loss from discontinued operations, net of income taxes	(1,506)	(6,304)
Net loss	(15,085)	(20,306)
Preferred stock dividends	(2,901)	(2,254)
Net loss attributable to common stockholders	$ (17,986)	$ (22,560)
Net loss per common share - Basic
Continuing operations (in dollars per share)	$ (1.20)	$ (1.30)
Discontinued operations (in dollars per share)	(0.11)	(0.50)
Net loss (in dollars per share)	(1.31)	(1.80)
Net loss per common share - Diluted
Continuing operations (in dollars per share)	(1.20)	(1.30)
Discontinued operations (in dollars per share)	(0.11)	(0.50)
Net loss (in dollars per share)	$ (1.31)	$ (1.80)
Shares used in computing loss per common share:
Basic (in shares)	13,771	12,519
Diluted (in shares)	13,771	12,519
Marine Technology Products [Member]
Revenues:
Total revenues	$ 23,107	$ 21,215
Cost of sales:
Total cost of sales	$ 17,085	$ 13,906