Note 4 - Income Taxes - Open Tax Years (Details)	12 Months Ended
	Jan. 31, 2020
Domestic Tax Authority [Member]
Open tax years	2017 2018 2019 2020
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Open tax years	2016 2017 2018 2019 2020
State and Local Jurisdiction [Member] | Michigan Department of Treasury [Member]
Open tax years	2016 2017 2018 2019 2020
State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member]
Open tax years	2016 2017 2018 2019 2020
Foreign Tax Authority [Member] | Australian Taxation Office [Member]
Open tax years	2016 2017 2018 2019 2020
Foreign Tax Authority [Member] | Ministry of the Economy, Finance and Industry, France [Member]
Open tax years	2017 2018 2019 2020
Foreign Tax Authority [Member] | Ministry of Finance, India [Member]
Open tax years	2010 2013 2018
Foreign Tax Authority [Member] | Revenue Commissioners, Ireland [Member]
Open tax years	2016 2017 2018 2019 2020
Foreign Tax Authority [Member] | HM Revenue & Customs [Member]
Open tax years	2019 2020
Foreign Tax Authority [Member] | State Administration of Taxation [Member]
Open tax years	2015 2016 2017 2018 2019 2020
Foreign Tax Authority [Member] | Servicio de Administración Tributaria [Member]
Open tax years	2015 2016 2017 2018 2019 2020