Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Revenues:
Total revenues	$ 8,713,000	$ 6,807,000	$ 17,800,000	$ 11,001,000
Cost of sales:
Total cost of sales	5,175,000	4,583,000	10,973,000	8,234,000
Gross profit	3,538,000	2,224,000	6,827,000	2,767,000
Operating expenses:
Selling, general and administrative	3,789,000	3,378,000	8,061,000	7,195,000
Research and development	833,000	888,000	1,847,000	1,741,000
Depreciation and amortization	467,000	557,000	946,000	1,223,000
Total operating expenses	5,089,000	4,823,000	10,854,000	10,159,000
Operating loss	(1,551,000)	(2,599,000)	(4,027,000)	(7,392,000)
Other (expense) income:
Other, net	(76,000)	57,000	(194,000)	1,004,000
Total other (expense) income	(76,000)	57,000	(194,000)	1,004,000
Loss from continuing operations before income taxes	(1,627,000)	(2,542,000)	(4,221,000)	(6,388,000)
Provision for income taxes	(131,000)	(197,000)	(342,000)	(52,000)
Net loss from continuing operations	(1,758,000)	(2,739,000)	(4,563,000)	(6,440,000)
(Loss) income from discontinued operations, net of income taxes	(162,000)	79,000	224,000	(204,000)
Net loss	(1,920,000)	(2,660,000)	(4,339,000)	(6,644,000)
Preferred stock dividends - declared	0	(682,000)	(947,000)	(1,266,000)
Preferred stock dividends - undeclared	(947,000)	0	(947,000)	0
Net loss attributable to common stockholders	$ (2,867,000)	$ (3,342,000)	$ (6,233,000)	$ (7,910,000)
Net (loss) income per common share - Basic
Continuing operations (in dollars per share)	$ (0.20)	$ (0.25)	$ (0.47)	$ (0.56)
Discontinued operations (in dollars per share)	(0.01)	0.01	0.02	(0.01)
Net loss (in dollars per share)	(0.21)	(0.24)	(0.45)	(0.57)
Net (loss) income per common share - Diluted
Continuing operations (in dollars per share)	(0.20)	(0.25)	(0.47)	(0.56)
Discontinued operations (in dollars per share)	(0.01)	0.01	0.02	(0.01)
Net loss (in dollars per share)	$ (0.21)	$ (0.24)	$ (0.45)	$ (0.57)
Shares used in computing net loss per common share:
Basic (in shares)	13,782	13,774	13,779	13,767
Diluted (in shares)	13,782	13,774	13,779	13,767
Marine Technology Products [Member]
Revenues:
Total revenues	$ 8,713,000	$ 6,807,000	$ 17,800,000	$ 11,001,000
Cost of sales:
Total cost of sales	$ 5,175,000	$ 4,583,000	$ 10,973,000	$ 8,234,000