Note 9 - Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($)	Jan. 31, 2025	Jan. 31, 2024
Amortizable intangible assets, gross carrying amount	$ 15,511,000	$ 15,457,000
Amortizable intangible assets, accumulated amortization	(13,203,000)	(12,569,000)
Amortizable intangible assets, net carrying amount	(2,308,000)	(2,888,000)
Intangible assets, net	2,308,000	2,888,000
Proprietary Rights [Member]
Amortizable intangible assets, gross carrying amount	7,472,000	7,473,000
Amortizable intangible assets, accumulated amortization	(5,501,000)	(5,053,000)
Amortizable intangible assets, net carrying amount	(1,971)	(2,420,000)
Intangible assets, net	$ 1,971	$ 2,420,000
Proprietary Rights [Member] | Weighted Average [Member]
Weighted average life (Year)		3 years 10 months 24 days
Customer Relationships [Member]
Weighted average life (Year)	8 years
Amortizable intangible assets, gross carrying amount	$ 4,884,000	$ 4,884,000
Amortizable intangible assets, accumulated amortization	(4,884,000)	(4,852,000)
Amortizable intangible assets, net carrying amount	0	(32,000)
Intangible assets, net	0	32,000
Patents [Member]
Amortizable intangible assets, gross carrying amount	2,540,000	2,540,000
Amortizable intangible assets, accumulated amortization	(2,269,000)	(2,190,000)
Amortizable intangible assets, net carrying amount	(271)	(350,000)
Intangible assets, net	271	$ 350,000
Patents [Member] | Weighted Average [Member]
Weighted average life (Year)		10 months 24 days
Trade Names [Member]
Amortizable intangible assets, gross carrying amount	134,000	$ 134,000
Amortizable intangible assets, accumulated amortization	(121,000)	(108,000)
Amortizable intangible assets, net carrying amount	(13,000)	(26,000)
Intangible assets, net	13,000	$ 26,000
Trade Names [Member] | Weighted Average [Member]
Weighted average life (Year)		1 year 3 months 18 days
Other Intangible Assets [Member]
Amortizable intangible assets, gross carrying amount	481,000	$ 426,000
Amortizable intangible assets, accumulated amortization	(428,000)	(366,000)
Amortizable intangible assets, net carrying amount	(53)	(60,000)
Intangible assets, net	$ 53	$ 60,000
Other Intangible Assets [Member] | Weighted Average [Member]
Weighted average life (Year)		1 month 6 days