Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Revenues:
Sale of marine technology products	$ 4,974,000	$ 3,038,000	$ 23,132,000	$ 16,142,000
Total revenues	4,974,000	3,038,000	23,132,000	16,142,000
Cost of sales:
Total cost of sales	2,721,000	2,176,000	13,402,000	10,446,000
Gross profit	2,253,000	862,000	9,730,000	5,696,000
Operating expenses:
Selling, general and administrative	2,941,000	3,023,000	9,160,000	9,867,000
Research and development	508,000	412,000	1,479,000	1,063,000
Depreciation and amortization	257,000	331,000	892,000	1,011,000
Total operating expenses	3,706,000	3,766,000	11,531,000	11,941,000
Operating loss	(1,453,000)	(2,904,000)	(1,801,000)	(6,245,000)
Other (expense) income:
Interest expense	(169,000)	0	(536,000)	(4,000)
Other, net	25,000	59,000	336,000	(186,000)
Total other (expense) income	(144,000)	59,000	(200,000)	(190,000)
Loss from continuing operations before income taxes	(1,597,000)	(2,845,000)	(2,001,000)	(6,435,000)
Provision for income taxes	(112,000)	(38,000)	(590,000)	(380,000)
Net loss from continuing operations	(1,709,000)	(2,883,000)	(2,591,000)	(6,815,000)
Income (loss) from discontinued operations, net of income taxes, (including a $2,393 gain on the sale of Klein for the three and nine months ended October 31, 2023)	2,277,000	(2,276,000)	1,424,000	(2,683,000)
Net income (loss)	568,000	(5,159,000)	(1,167,000)	(9,498,000)
Preferred stock dividends - declared	(947,000)	0	(947,000)	(947,000)
Preferred stock dividends - undeclared	0	(947,000)	(1,894,000)	(1,894,000)
Net loss attributable to common stockholders	$ (379,000)	$ (6,106,000)	$ (4,008,000)	$ (12,339,000)
Net loss per common share - Basic and Diluted
Continuing operations (in dollars per share)	$ (1.89)	$ (2.72)	$ (3.86)	$ (6.87)
Discontinued operations (in dollars per share)	1.62	(1.62)	1.01	(1.91)
Net loss (in dollars per share)	$ (0.27)	$ (4.34)	$ (2.85)	$ (8.78)
Shares used in computing net loss per common share:
Basic (in shares)	1,406	1,406	1,406	1,405
Diluted (in shares)	1,406	1,406	1,406	1,405
Marine Technology Products [Member]
Cost of sales:
Total cost of sales	$ 2,721,000	$ 2,176,000	$ 13,402,000	$ 10,446,000