Note 1 - Summary of Business and Significant Accounting Policies - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Accounts receivable	$ 83,908	$ 84,478
Doubtful accounts	(543)	(487)
Sales adjustments	(2,397)	(2,414)
Accounts receivable, net	$ 80,968	$ 81,577