Note 4 - Balance Sheet Components - Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
RSU tax withholding proceeds receivable	$ 12,630	$ 16,224
Prepaid expenses	9,664	9,526
Accrued interest receivable	7,073	5,440
Assets for product returns	1,936	1,596
Other	3,752	2,754
Total	$ 35,055	$ 35,540