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Note 9 - Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) | Jan. 31, 2025 | Jan. 31, 2024
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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

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 40 -SubTopic 30 -Topic 350 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480265/350-10-S45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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