Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Revenues:
Total revenues	$ 12,586,000	$ 9,087,000
Cost of sales:
Total cost of sales	7,169,000	5,798,000
Gross profit	5,417,000	3,289,000
Operating expenses:
Selling, general and administrative	3,874,000	4,272,000
Research and development	773,000	1,014,000
Depreciation and amortization	481,000	479,000
Total operating expenses	5,128,000	5,765,000
Operating income (loss)	289,000	(2,476,000)
Other expense:
Other, net	(111,000)	(118,000)
Total other expense	(111,000)	(118,000)
Income (loss) from continuing operations before income taxes	178,000	(2,594,000)
Provision for income taxes	(418,000)	(211,000)
Net loss from continuing operations	(240,000)	(2,805,000)
Income from discontinued operations, net of income taxes	0	386,000
Net loss	(240,000)	(2,419,000)
Preferred stock dividends - declared	0	(947,000)
Preferred stock dividends - undeclared	(947,000)	0
Net loss attributable to common stockholders	$ (1,187,000)	$ (3,366,000)
Net loss per common share - Basic and Diluted
Continuing operations (in dollars per share)	$ (0.09)	$ (0.27)
Discontinued operations (in dollars per share)	0	0.03
Net loss (in dollars per share)	$ (0.09)	$ (0.24)
Shares used in computing net loss per common share:
Basic (in shares)	13,789	13,775
Diluted (in shares)	13,789	13,775
Marine Technology Products [Member]
Revenues:
Total revenues	$ 12,586,000	$ 9,087,000
Cost of sales:
Total cost of sales	$ 7,169,000	$ 5,798,000