Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Revenues:
Total revenues	$ 8,347,000	$ 6,541,000	$ 19,348,000	$ 14,814,000
Cost of sales:
Total cost of sales	5,177,000	4,267,000	13,411,000	10,039,000
Gross profit	3,170,000	2,274,000	5,937,000	4,775,000
Operating expenses:
Selling, general and administrative	3,903,000	2,973,000	11,098,000	8,915,000
Research and development	826,000	912,000	2,567,000	2,077,000
Impairment of intangible assets	0	0	0	2,531,000
Depreciation and amortization	494,000	662,000	1,717,000	2,092,000
Total operating expenses	5,223,000	4,547,000	15,382,000	15,615,000
Operating loss	(2,053,000)	(2,273,000)	(9,445,000)	(10,840,000)
Other income:
Other, net	33,000	12,000	1,037,000	68,000
Total other income	33,000	12,000	1,037,000	68,000
Loss from continuing operations before income taxes	(2,020,000)	(2,261,000)	(8,408,000)	(10,772,000)
(Provision) benefit for income taxes	(59,000)	(109,000)	(111,000)	79,000
Loss from continuing operations	(2,079,000)	(2,370,000)	(8,519,000)	(10,693,000)
Loss from discontinued operations, net of income taxes	(499,000)	(1,220,000)	(703,000)	(6,143,000)
Net loss	(2,578,000)	(3,590,000)	(9,222,000)	(16,836,000)
Preferred stock dividends	(688,000)	(559,000)	(1,954,000)	(1,677,000)
Net loss attributable to common stockholders	$ (3,266,000)	$ (4,149,000)	$ (11,176,000)	$ (18,513,000)
Net loss per common share - Basic
Continuing operations (in dollars per share)	$ (0.20)	$ (0.24)	$ (0.76)	$ (1.01)
Discontinued operations (in dollars per share)	(0.04)	(0.10)	(0.05)	(0.50)
Net loss (in dollars per share)	(0.24)	(0.34)	(0.81)	(1.51)
Net loss per common share - Diluted
Continuing operations (in dollars per share)	(0.20)	(0.24)	(0.76)	(1.01)
Discontinued operations (in dollars per share)	(0.04)	(0.10)	(0.05)	(0.50)
Net loss (in dollars per share)	$ (0.24)	$ (0.34)	$ (0.81)	$ (1.51)
Shares used in computing net loss per common share:
Basic (in shares)	13,774	12,313	13,769	12,223
Diluted (in shares)	13,774	12,313	13,769	12,223
Marine Technology Products [Member]
Revenues:
Total revenues	$ 8,347,000	$ 6,541,000	$ 19,348,000	$ 14,814,000
Cost of sales:
Total cost of sales	$ 5,177,000	$ 4,267,000	$ 13,411,000	$ 10,039,000