Note 10 - Income Taxes - Valuation Allowance (Details) - USD ($) $ in Millions	Jul. 31, 2019	Jan. 31, 2019
Valuation Allowance	$ 46.2	$ 34.9
Federal and State Tax Authority [Member]
Valuation Allowance	26.8	24.7
Foreign Tax Authority [Member] | Revenue Commissioners, Ireland [Member]
Valuation Allowance	9.9
Foreign Tax Authority [Member] | Secretariat of the Federal Revenue Bureau of Brazil [Member]
Valuation Allowance	5.4	5.2
Foreign Tax Authority [Member] | Federal Ministry of Finance, Germany [Member]
Valuation Allowance	2.7	2.9
Foreign Tax Authority [Member] | Inland Revenue, Hong Kong [Member]
Valuation Allowance	1.2	1.2
Foreign Tax Authority [Member] | Income Tax Authority, South Africa [Member]
Valuation Allowance	0.2
Foreign Tax Authority [Member] | Administration of the Treasury, Belgium [Member]
Valuation Allowance		$ 0.9