Note 7 - Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
Apr. 30, 2023	Apr. 30, 2022	Jan. 31, 2023
Weighted average remaining lease term, Operating leases (Year)	1 year 11 months 8 days		1 year 11 months 23 days
Weighted average discount rate, Operating leases	13.00%		13.00%
Operating cash flows from operating leases	$ (221)	$ (203)
Right-of-use assets obtained in exchange for lease liabilities, Operating leases	$ 223	$ 0

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (c)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
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- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

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-Topic 842
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-Name Accounting Standards Codification
-Section 55
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479589/842-20-55-53

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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