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Note 3 - Balance Sheet Components - Summary of Balance Sheet Amounts (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Cash | $ 8,423 | $ 8,971
Cash equivalents | 14,476 | 47,207
Cash and cash equivalents | 22,899 | 56,178
Restricted cash | 38 | 39
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents | 22,937 | 56,217
Inventories: |  |
Finished goods | 3,072 | 3,473
Raw materials | 632 | 855
Reserve for obsolescence | (20) | (35)
Inventory, Net | 3,684 | 4,293
Other accrued expenses: |  |
Sales returns | 51 | 81
Employee-related expense | 598 | 668
Warehousing, inventory-related and other | 701 | 421
Accrued Liabilities, Current | 1,350 | 1,170
Deferred revenue: |  |
Deferred revenue | 6,832 | 6,166
Unshipped Product [Member] |  |
Deferred revenue: |  |
Deferred revenue | 5,195 | 4,417
Auto ship advances [Member] |  |
Deferred revenue: |  |
Deferred revenue | $ 1,637 | $ 1,749

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