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Note 7 - Stock-based Compensation (Details Textual) $ in Thousands	3 Months Ended
	Apr. 30, 2019 USD ($) shares	Apr. 30, 2018 USD ($)
Number of Incentive Stock Plans Under Which New Awards May Be Granted	1
Common Stock, Capital Shares Reserved for Future Issuance | shares	835,332
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total | shares	0
Proceeds from Stock Options Exercised	$ 79	$ 25
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 100
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year
Restricted Stock [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 1,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years
Maximum [Member]
Proceeds from Stock Options Exercised	$ 100

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+ References

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
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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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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Net number of share options (or share units) granted during the period.

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