Note 7 - Stock-based Compensation (Details Textual) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 31, 2022 USD ($) shares	Jul. 31, 2022 USD ($) shares
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	293,075	293,075
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total (in shares)		0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)		0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares, Ending Balance (in shares)	0	0
Share-Based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total (in shares)		9,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)		12,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total \| $	$ 0	$ 0
Restricted Stock [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total \| $	$ 1,400	$ 1,400
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		2 years

Aggregate number of common shares reserved for future issuance.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Gross number of share options (or share units) granted during the period.

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Number of non-vested options outstanding.

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Number of share options (or share units) exercised during the current period.

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