Note 10 - Accumulated Other Comprehensive Loss (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Jan. 31, 2020	Jan. 31, 2019
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 0	$ 0

Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Name:	us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration