Note 9 - Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($)	Jan. 31, 2024	Jan. 31, 2023
Amortizable intangible assets, gross carrying amount	$ 15,457,000	$ 15,406,000
Amortizable intangible assets, accumulated amortization	(12,569,000)	(11,773,000)
Amortizable intangible assets, net carrying amount	(2,888,000)	(3,633,000)
Intangible assets, net	2,888,000	3,633,000
Proprietary Rights [Member]
Amortizable intangible assets, gross carrying amount	7,473,000	7,473,000
Amortizable intangible assets, accumulated amortization	(5,053,000)	(4,612,000)
Amortizable intangible assets, net carrying amount	(2,420)	(2,861,000)
Intangible assets, net	$ 2,420	2,861,000
Proprietary Rights [Member] | Weighted Average [Member]
Weighted average life (Year)	4 years 9 months 18 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	(4,852,000)	(4,754,000)
Amortizable intangible assets, net carrying amount	(32)	(130,000)
Intangible assets, net	$ 32	130,000
Customer Relationships [Member] | Weighted Average [Member]
Weighted average life (Year)	1 month 6 days
Patents [Member]
Amortizable intangible assets, gross carrying amount	$ 2,540,000	2,540,000
Amortizable intangible assets, accumulated amortization	(2,190,000)	(2,027,000)
Amortizable intangible assets, net carrying amount	(350)	(513,000)
Intangible assets, net	$ 350	513,000
Patents [Member] | Weighted Average [Member]
Weighted average life (Year)	1 year 3 months 18 days
Trade Names [Member]
Amortizable intangible assets, gross carrying amount	$ 134,000	134,000
Amortizable intangible assets, accumulated amortization	(108,000)	(97,000)
Amortizable intangible assets, net carrying amount	(26,000)	(37,000)
Intangible assets, net	$ 26,000	37,000
Trade Names [Member] | Weighted Average [Member]
Weighted average life (Year)	2 years 3 months 18 days
Other Intangible Assets [Member]
Amortizable intangible assets, gross carrying amount	$ 426,000	375,000
Amortizable intangible assets, accumulated amortization	(366,000)	(283,000)
Amortizable intangible assets, net carrying amount	(60)	(92,000)
Intangible assets, net	$ 60	$ 92,000
Other Intangible Assets [Member] | Weighted Average [Member]
Weighted average life (Year)	3 months 18 days