Note 1 - Summary of Significant Accounting Policies - Net Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Accounts receivable	$ 57,941	$ 38,109
Less: Allowance for doubtful accounts	(256)	(273)
Accounts receivable, net	$ 57,685	$ 37,836