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Note 3 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Deferred tax assets: |  |  |
Stock compensation expense | $ 272 | $ 173 |
Goodwill | 182 | 591 |
Royalty accruals | 10 | 10 |
Bad debt allowance | 53 | 51 |
Net operating loss carryforwards | 12,158 | 11,950 |
Credit carry-forwards | 1,058 | 992 |
Inventory reserve | 233 | 217 |
Depreciation | 585 | 556 |
Research and Development Costs | 528 | 0 |
Other | 471 | 376 |
Total deferred tax assets | 15,550 | 14,916 |
Deferred tax liabilities: |  |  |
Intangible assets | (100) | (105) |
Total deferred tax liabilities | (100) | (105) |
Net deferred tax asset before valuation allowance | 15,450 | 14,811 |
Valuation allowances for deferred tax assets | (15,627) | (14,950) | $ (15,971)
Net deferred tax liability | $ (177) | $ (139) |

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