Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022
Revenues:
Total revenues	$ 35,091	$ 23,107
Cost of sales:
Total cost of sales	22,116	17,085
Gross profit	12,975	6,022
Operating expenses:
Selling, general and administrative	15,304	14,761
Research and development	3,398	3,596
Depreciation and amortization	1,887	2,209
Total operating expenses	20,589	20,566
Operating loss	(7,614)	(14,544)
Other income:
Other income, net	882	926
Total other income	882	926
Loss from continuing operations before income taxes	(6,732)	(13,618)
(Provision) benefit for income taxes	(699)	39
Loss from continuing operations	(7,431)	(13,579)
Loss from discontinued operations, net of income taxes	(1,401)	(1,506)
Net loss	(8,832)	(15,085)
Preferred stock dividends - declared	(947)	(2,901)
Preferred stock dividends - undeclared	(2,841)	0
Net loss attributable to common stockholders	$ (12,620)	$ (17,986)
Net loss per common share - Basic
Continuing operations (in dollars per share)	$ (0.82)	$ (1.20)
Discontinued operations (in dollars per share)	(0.10)	(0.11)
Net loss (in dollars per share)	(0.92)	(1.31)
Net loss per common share - Diluted
Continuing operations (in dollars per share)	(0.82)	(1.20)
Discontinued operations (in dollars per share)	(0.10)	(0.11)
Net loss (in dollars per share)	$ (0.92)	$ (1.31)
Shares used in computing loss per common share:
Basic (in shares)	13,784	13,771
Diluted (in shares)	13,784	13,771
Marine Technology Products [Member]
Revenues:
Total revenues	$ 35,091	$ 23,107
Cost of sales:
Total cost of sales	$ 22,116	$ 17,085