Note 4 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	35.00%
Undistributed Earnings of Foreign Subsidiaries	$ 92,000,000
Deferred Tax Assets, Valuation Allowance, Total	50,972,000	$ 34,898,000
Operating Loss Carryforwards, Total	67,500,000
Tax Credit Carryforward, Amount	22,100,000
Increase of Reserves for Uncertain Tax Positions	3,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	20,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	100,000
Research Tax Credit Carryforward [Member] | Expiring October 2020 [Member]
Tax Credit Carryforward, Amount	14,000
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	7,000,000
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Tax Credit Carryforward, Amount	$ 8,900,000
Foreign Tax Authority [Member] | Ministry of Finance, India [Member]
Income Tax Examination, Year under Examination	2010 2013 2018
Foreign Tax Authority [Member] | Federal Ministry of Finance, Germany [Member]
Deferred Tax Assets, Valuation Allowance, Total	$ 2,600,000	$ 2,900,000
Income Tax Examination, Year under Examination	2015 2016 2017