Note 7 - Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2026	Jan. 31, 2026	Jan. 30, 2026
Amortizable intangible assets, gross carrying amount	$ 15,525		$ 15,528
Amortizable intangible assets, accumulated amortization	(13,911)		(13,775)
Intangible assets, net	1,614	$ 1,753	1,753
Proprietary Rights [Member]
Amortizable intangible assets, gross carrying amount	7,472		7,472
Amortizable intangible assets, accumulated amortization	(6,016)		(5,911)
Intangible assets, net	$ 1,456		1,561
Proprietary Rights [Member] \| Weighted Average [Member]
Weighted average life (Year)	2 years 10 months 24 days
Customer Relationships [Member]
Amortizable intangible assets, gross carrying amount	$ 4,884		4,884
Amortizable intangible assets, accumulated amortization	(4,884)		(4,884)
Intangible assets, net	0		0
Patents [Member]
Amortizable intangible assets, gross carrying amount	2,540		2,540
Amortizable intangible assets, accumulated amortization	(2,383)		(2,362)
Intangible assets, net	$ 157		178
Patents [Member] \| Weighted Average [Member]
Weighted average life (Year)	7 months 6 days
Trade Names [Member]
Amortizable intangible assets, gross carrying amount	$ 134		134
Amortizable intangible assets, accumulated amortization	(133)		(130)
Intangible assets, net	$ 1		4
Trade Names [Member] \| Weighted Average [Member]
Weighted average life (Year)	1 month 6 days
Other Intangible Assets [Member]
Amortizable intangible assets, gross carrying amount	$ 495		498
Amortizable intangible assets, accumulated amortization	(495)		(488)
Intangible assets, net	$ 0		$ 10

Useful life of finite-lived intangible asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed.

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Amount of accumulated amortization of finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed.

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Amount, before accumulated amortization, of finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed.

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Amount, after accumulated amortization, of finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed.

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