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Note 5 - Trade Accounts Receivable (Details Textual) - USD ($) $ in Millions | Jan. 31, 2021 | Jan. 31, 2020
--- | --- | ---
Unbilled Receivables, Current | $ 0.3 | $ 1.4

X
- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_UnbilledReceivablesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant