Note 4 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Unrecognized tax benefits at beginning of the year	$ 1,171	$ 1,168
Decreases as a result of tax positions taken in a prior period	0	0
Increases as a result of tax positions taken in the prior period	130	143
Reduction as a result of a lapse of the statute of limitations	(5)	(37)
Decreases as a result of settlements with taxing authorities	0	(103)
Unrecognized tax benefit at end of year	$ 1,296	$ 1,171