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Note 3 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Deferred tax assets: |  |  |
Stock compensation expense | $ 173 | $ 1,240 |
Goodwill | 591 | 986 |
Royalty accruals | 10 | 560 |
Bad debt allowance | 51 | 338 |
Net operating loss carryforwards | 11,950 | 10,959 |
Credit carry-forwards | 992 | 841 |
Inventory reserve | 217 | 206 |
Depreciation | 556 | 499 |
Other | 376 | 334 |
Total deferred tax assets | 14,916 | 15,963 |
Deferred tax liabilities: |  |  |
Intangible assets | (105) | (126) |
Total deferred tax liabilities | (105) | (126) |
Net deferred tax asset before valuation allowance | 14,811 | 15,837 |
Valuation allowances for deferred tax assets | (14,950) | (15,971) | $ (15,394)
Net deferred tax liability | $ (139) | $ (134) |

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