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Note 3 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Deferred tax assets: |  |  |
Stock compensation expense | $ 80 | $ 250 |
Royalty accruals | 10 | 10 |
Bad debt allowance | 51 | 52 |
Net operating loss carryforwards | 9,067 | 12,048 |
Credit carry-forwards | 1,472 | 1,134 |
Inventory reserve | 154 | 153 |
Depreciation | 433 | 548 |
Research and Development Costs | 2,233 | 1,053 |
Other | 399 | 606 |
Total deferred tax assets | 13,899 | 15,854 |
Deferred tax liabilities: |  |  |
Goodwill | (296) | (238) |
Intangible assets | (82) | (89) |
Total deferred tax liabilities | (378) | (327) |
Net deferred tax asset before valuation allowance | 13,521 | 15,527 |
Valuation allowances for deferred tax assets | (13,697) | (15,699) | $ (15,627)
Net deferred tax liability | $ (176) | $ (172) |

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