Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Feb. 01, 2018	Jan. 31, 2018
Income Tax Expense (Benefit), Total	$ 1,471	$ 832	$ 2,654	$ 1,452
Effective Income Tax Rate Reconciliation, Percent, Total	57.00%	253.00%	51.00%	64.00%
Income Tax Expense, Transition Tax on Accumulated Foreign Earnings			$ 10,000
Transition Tax for Accumulated Foreign Earnings, Liability	$ 2,000		2,000
Retained Earnings (Accumulated Deficit), Ending Balance	(53,655)		(53,655)		$ (53,434)	$ (75,559)
Unrecognized Tax Benefits, Ending Balance	1,800		1,800
Unrecognized Tax Benefits, Period Increase (Decrease), Total			(900)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	300		300
Deferred Tax Assets, Valuation Allowance, Total	$ 36,400		$ 36,400			$ 33,700
Accounting Standards Update 2016-16 [Member]
Retained Earnings (Accumulated Deficit), Ending Balance					9,584
Deferred Tax Assets, Net of Valuation Allowance, Total					$ 9,600