Note 1 - Summary of Business and Significant Accounting Policies - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jan. 31, 2021	Jan. 31, 2020
Accounts receivable	$ 85,949	$ 83,908
Doubtful accounts	(1,101)	(543)
Sales adjustments	(2,239)	(2,397)
Accounts receivable, net	$ 82,609	$ 80,968