Note 7 - Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2025	Jan. 31, 2025
Amortizable intangible assets, gross carrying amount	$ 15,513	$ 15,511
Amortizable intangible assets, accumulated amortization	(13,351)	(13,203)
Intangible assets, net	2,162	2,308
Proprietary Rights [Member]
Amortizable intangible assets, gross carrying amount	7,472	7,472
Amortizable intangible assets, accumulated amortization	(5,606)	(5,501)
Intangible assets, net	$ 1,866	1,971
Proprietary Rights [Member] | Weighted Average [Member]
Weighted average life (Year)	3 years 7 months 6 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	(2,292)	(2,269)
Intangible assets, net	$ 248	271
Patents [Member] | Weighted Average [Member]
Weighted average life (Year)	10 months 24 days
Trade Names [Member]
Amortizable intangible assets, gross carrying amount	$ 134	134
Amortizable intangible assets, accumulated amortization	(121)	(121)
Intangible assets, net	$ 13	13
Trade Names [Member] | Weighted Average [Member]
Weighted average life (Year)	1 year 1 month 6 days
Other Intangible Assets [Member]
Amortizable intangible assets, gross carrying amount	$ 483	481
Amortizable intangible assets, accumulated amortization	(448)	(428)
Intangible assets, net	$ 35	$ 53
Other Intangible Assets [Member] | Weighted Average [Member]
Weighted average life (Year)	1 month 6 days