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Note 9 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Inventory reserve | $ 19 | $ 12
Allowance for doubtful accounts | 15 | 20
Lease liability | 19 | 31
Unrealized gains on marketable securities | 3 | 166
Stock-based compensation | 1 | 8
Depreciation and amortization | 13 | 11
Federal tax loss carryforwards | 77 | 0
Other reserves and accruals | 24 | 17
Total deferred tax assets | 171 | 265
Right-of-use asset | 19 | 31
Total deferred tax liabilities | 19 | 31
Net deferred tax assets before valuation allowance | 152 | 234
Valuation allowance | 0 | 0
Net deferred tax assets (liabilities) | $ 152 | $ 234

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