Note 10 - Income Taxes - Valuation Allowance (Details) - USD ($) $ in Millions	Jul. 31, 2021	Jan. 31, 2021
Valuation Allowance	$ 48.3	$ 48.6
Federal and State Tax Authority [Member]
Valuation Allowance	29.7	30.3
Foreign Tax Authority [Member] | Revenue Commissioners, Ireland [Member]
Valuation Allowance	12.3	12.0
Foreign Tax Authority [Member] | Secretariat of the Federal Revenue Bureau of Brazil [Member]
Valuation Allowance	6.1	6.1
Foreign Tax Authority [Member] | Income Tax Authority, South Africa [Member]
Valuation Allowance	$ 0.2	$ 0.2