Note 1 - Summary of Significant Accounting Policies - Net Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Accounts receivable	$ 38,109	$ 55,607
Less: Allowance for doubtful accounts	(273)	(879)
Accounts receivable, net	$ 37,836	$ 54,728