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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