Note 7 - Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Balance at beginning of the year	$ 1,545	$ 1,447
Increases in positions taken in a prior period	2
Decreases in positions taken in a prior period		(26)
Increases in positions taken in a current period	65	132
Decreases due to lapse of statute of limitations	(21)	(8)
Balance at end of the year	$ 1,591	$ 1,545