Note 1 - Summary of Business and Significant Accounting Policies - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017
Accounts receivable	$ 85,281	$ 71,647
Doubtful accounts	(396)	(1,090)
Sales adjustments	(1,367)	(1,116)
Accounts receivable, net	$ 83,518	$ 69,441