Note 3 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Unrecognized tax benefits at beginning of the year	$ 1,743	$ 1,545
Decreases as a result of tax positions taken in a prior period	(115)	(79)
Increases as a result of tax positions taken in the prior period	58	365
Reduction as a result of a lapse of the statute of limitations	(24)	(88)
Unrecognized tax benefit at end of year	$ 1,662	$ 1,743