Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Revenues:
Total revenues	$ 9,087,000	$ 4,194,000
Cost of sales:
Total cost of sales	5,798,000	3,651,000
Gross profit	3,289,000	543,000
Operating expenses:
Selling, general and administrative	4,272,000	3,817,000
Research and development	1,014,000	853,000
Depreciation and amortization	479,000	666,000
Total operating expenses	5,765,000	5,336,000
Operating loss	(2,476,000)	(4,793,000)
Other (expense) income:
Other, net	(118,000)	947,000
Total other (expense) income	(118,000)	947,000
Loss from continuing operations before income taxes	(2,594,000)	(3,846,000)
(Provision) benefit for income taxes	(211,000)	145,000
Net loss from continuing operations	(2,805,000)	(3,701,000)
Income (loss) from discontinued operations, net of income taxes	386,000	(283,000)
Net loss	(2,419,000)	(3,984,000)
Preferred stock dividends	(947,000)	(584,000)
Net loss attributable to common stockholders	$ (3,366,000)	$ (4,568,000)
Net loss per common share - Basic
Continuing operations (in dollars per share)	$ (0.27)	$ (0.31)
Discontinued operations (in dollars per share)	0.03	(0.02)
Net loss (in dollars per share)	(0.24)	(0.33)
Net loss per common share - Diluted
Continuing operations (in dollars per share)	(0.27)	(0.31)
Discontinued operations (in dollars per share)	0.03	(0.02)
Net loss (in dollars per share)	$ (0.24)	$ (0.33)
Shares used in computing net loss per common share:
Basic (in shares)	13,775	13,759
Diluted (in shares)	13,775	13,759
Marine Technology Products [Member]
Revenues:
Total revenues	$ 9,087,000	$ 4,194,000
Cost of sales:
Total cost of sales	$ 5,798,000	$ 3,651,000