Note 3 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		34.00%
Income Tax Rate, Transition Tax on Accumulated Foreign Earnings, Percent		15.50%
Income Tax Expense, Transition Tax on Accumulated Foreign Earnings		$ 10,000,000
Accumulated Foreign Earnings, Subject to Transition Tax		64,000,000
Income Tax Benefit, Net Operating Losses Related to Deemed Repatriation of Accumulated Foreign Earnings		5,600,000
Income Tax Benefit, Research and Development Tax Credits Related to Deemed Repatriation of Accumulated Foreign Earnings		1,600,000
Income Tax Benefit, Foreign Tax Credits Related to Deemed Repatriation of Accumulated Foreign Earnings		4,100,000
Transition Tax for Accumulated Foreign Earnings, Liability		2,000,000
Undistributed Earnings of Foreign Subsidiaries		81,000,000
Deferred Tax Assets, Valuation Allowance		33,665,000	$ 29,868,000
Operating Loss Carryforwards		36,700,000
Tax Credit Carryforward, Amount		20,200,000
Unrecognized Tax Benefits, Period Increase (Decrease)		(100,000)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		39,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		$ 300,000
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%