Note 4 - Income Taxes (Details Textual)	12 Months Ended
Jan. 31, 2021 USD ($)
Undistributed Earnings of Foreign Subsidiaries	$ 90,000,000
Operating Loss Carryforwards, Total	13,800,000
Tax Credit Carryforward, Amount	24,312,000
Unrecognized Tax Benefits, Period Increase (Decrease), Total	100,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	22,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 100,000
Foreign Tax Authority [Member] \| Ministry of Finance, India [Member]
Income Tax Examination, Year under Examination	2010 2013 2018
Foreign Tax Authority [Member] \| Ministry of the Economy, Finance and Industry, France [Member]
Income Tax Examination, Year under Examination	2018 2019 2020
Research Tax Credit Carryforward [Member] \| Expiring October 2020 [Member]
Tax Credit Carryforward, Amount	$ 14,000

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