Note 9 - Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2024	Jan. 31, 2024
Amortizable intangible assets, gross carrying amount	$ 15,447	$ 15,457
Amortizable intangible assets, accumulated amortization	(12,733)	(12,569)
Intangible assets, net	2,714	2,888
Proprietary Rights [Member]
Amortizable intangible assets, gross carrying amount	7,473	7,473
Amortizable intangible assets, accumulated amortization	(5,168)	(5,053)
Intangible assets, net	$ 2,305	2,420
Proprietary Rights [Member] | Weighted Average [Member]
Weighted average life (Year)	4 years 7 months 6 days
Customer Relationships [Member]
Amortizable intangible assets, gross carrying amount	$ 4,884	4,884
Amortizable intangible assets, accumulated amortization	(4,876)	(4,852)
Intangible assets, net	$ 8	32
Customer Relationships [Member] | Weighted Average [Member]
Weighted average life (Year)	1 month 6 days
Patents [Member]
Amortizable intangible assets, gross carrying amount	$ 2,540	2,540
Amortizable intangible assets, accumulated amortization	(2,216)	(2,190)
Intangible assets, net	$ 324	350
Patents [Member] | Weighted Average [Member]
Weighted average life (Year)	1 year 2 months 12 days
Trade Names [Member]
Amortizable intangible assets, gross carrying amount	$ 134	134
Amortizable intangible assets, accumulated amortization	(111)	(108)
Intangible assets, net	$ 23	26
Trade Names [Member] | Weighted Average [Member]
Weighted average life (Year)	2 years 1 month 6 days
Other Intangible Assets [Member]
Amortizable intangible assets, gross carrying amount	$ 416	426
Amortizable intangible assets, accumulated amortization	(362)	(366)
Intangible assets, net	$ 54	$ 60
Other Intangible Assets [Member] | Weighted Average [Member]
Weighted average life (Year)	2 months 12 days