Note 3 - Balance Sheet Components - Summary of Balance Sheet Amounts (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Cash	$ 11,460	$ 12,834
Cash equivalents	55,150	56,833
Cash and cash equivalents	66,610	69,667
Restricted cash	38	79
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	66,648	69,746
Inventories:
Finished goods	4,023	3,653
Raw materials	992	890
Reserve for obsolescence	(33)	(18)
Inventory, Net	4,982	4,525
Other accrued expenses:
Sales returns	89	70
Employee-related expense	508	737
Warehousing, inventory-related and other	508	374
Accrued Liabilities, Current	1,105	1,181
Deferred revenue:
Deferred revenue	5,617	5,597
Unshipped Product [Member]
Deferred revenue:
Deferred revenue	3,880	3,822
Auto ship advances [Member]
Deferred revenue:
Deferred revenue	$ 1,737	$ 1,775