Note 4 - Income Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Valuation Allowance	$ 50,972	$ 34,898
Federal and State Tax Authority [Member]
Valuation Allowance	30,300	24,700
Foreign Tax Authority [Member] | Revenue Commissioners, Ireland [Member]
Valuation Allowance	11,600
Foreign Tax Authority [Member] | Secretariat of the Federal Revenue Bureau of Brazil [Member]
Valuation Allowance	5,700	5,200
Foreign Tax Authority [Member] | Federal Ministry of Finance, Germany [Member]
Valuation Allowance	2,600	2,900
Foreign Tax Authority [Member] | Inland Revenue, Hong Kong [Member]
Valuation Allowance	600	1,200
Foreign Tax Authority [Member] | Income Tax Authority, South Africa [Member]
Valuation Allowance	200
Foreign Tax Authority [Member] | Administration of the Treasury, Belgium [Member]
Valuation Allowance		$ 900