Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Revenues:
Total revenues	$ 4,884,000	$ 8,347,000	$ 22,684,000	$ 19,348,000
Cost of sales:
Total cost of sales	3,382,000	5,177,000	14,355,000	13,411,000
Gross profit	1,502,000	3,170,000	8,329,000	5,937,000
Operating expenses:
Selling, general and administrative	3,556,000	3,903,000	11,617,000	11,098,000
Research and development	843,000	826,000	2,690,000	2,567,000
Depreciation and amortization	469,000	494,000	1,415,000	1,717,000
Total operating expenses	4,868,000	5,223,000	15,722,000	15,382,000
Operating loss	(3,366,000)	(2,053,000)	(7,393,000)	(9,445,000)
Other income (expense):
Other, net	90,000	33,000	(104,000)	1,037,000
Total other income (expense)	90,000	33,000	(104,000)	1,037,000
Loss from continuing operations before income taxes	(3,276,000)	(2,020,000)	(7,497,000)	(8,408,000)
Provision for income taxes	(37,000)	(59,000)	(379,000)	(111,000)
Net loss from continuing operations	(3,313,000)	(2,079,000)	(7,876,000)	(8,519,000)
Loss from discontinued operations, net of income taxes	(1,846,000)	(499,000)	(1,622,000)	(703,000)
Net loss	(5,159,000)	(2,578,000)	(9,498,000)	(9,222,000)
Preferred stock dividends - declared	0	(688,000)	(947,000)	(1,954,000)
Preferred stock dividends - undeclared	(947,000)	0	(1,894,000)	0
Net loss attributable to common stockholders	$ (6,106,000)	$ (3,266,000)	$ (12,339,000)	$ (11,176,000)
Net loss per common share - Basic
Continuing operations (in dollars per share)	$ (0.31)	$ (0.20)	$ (0.78)	$ (0.76)
Discontinued operations (in dollars per share)	(0.13)	(0.04)	(0.12)	(0.05)
Net loss (in dollars per share)	(0.44)	(0.24)	(0.90)	(0.81)
Net loss per common share - Diluted
Continuing operations (in dollars per share)	(0.31)	(0.20)	(0.78)	(0.76)
Discontinued operations (in dollars per share)	(0.13)	(0.04)	(0.12)	(0.05)
Net loss (in dollars per share)	$ (0.44)	$ (0.24)	$ (0.90)	$ (0.81)
Shares used in computing net loss per common share:
Basic (in shares)	13,788	13,774	13,782	13,769
Diluted (in shares)	13,788	13,774	13,782	13,769
Marine Technology Products [Member]
Revenues:
Total revenues	$ 4,884,000	$ 8,347,000	$ 22,684,000	$ 19,348,000
Cost of sales:
Total cost of sales	$ 3,382,000	$ 5,177,000	$ 14,355,000	$ 13,411,000