Note 9 - Income Taxes - Valuation Allowance (Details) - USD ($) $ in Millions	Jul. 31, 2020	Jan. 31, 2020
Valuation Allowance	$ 53.8	$ 51.0
Federal and State Tax Authority [Member]
Valuation Allowance	32.1	30.3
Foreign Tax Authority [Member] | Revenue Commissioners, Ireland [Member]
Valuation Allowance	11.9	11.6
Foreign Tax Authority [Member] | Secretariat of the Federal Revenue Bureau of Brazil [Member]
Valuation Allowance	6.2	5.7
Foreign Tax Authority [Member] | Federal Ministry of Finance, Germany [Member]
Valuation Allowance	2.8	2.6
Foreign Tax Authority [Member] | Inland Revenue, Hong Kong [Member]
Valuation Allowance	0.6	0.6
Foreign Tax Authority [Member] | Income Tax Authority, South Africa [Member]
Valuation Allowance	$ 0.2	$ 0.2