Note 4 - Income Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands	Jan. 31, 2021	Jan. 31, 2020
Valuation Allowance	$ 48,571	$ 50,972
Federal and State Tax Authority [Member]
Valuation Allowance	30,300	30,300
Foreign Tax Authority [Member] | Revenue Commissioners, Ireland [Member]
Valuation Allowance	12,000	11,600
Foreign Tax Authority [Member] | Secretariat of the Federal Revenue Bureau of Brazil [Member]
Valuation Allowance	6,100	5,700
Foreign Tax Authority [Member] | Federal Ministry of Finance, Germany [Member]
Valuation Allowance	0	2,600
Foreign Tax Authority [Member] | Inland Revenue, Hong Kong [Member]
Valuation Allowance	0	600
Foreign Tax Authority [Member] | Income Tax Authority, South Africa [Member]
Valuation Allowance	$ 200	$ 200