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Note 5 - Income Taxes - Tax Reserves (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Taxes | $ 42 | $ 13 | $ 8
Interest | 14 |  |
Penalty | 13 |  |
Total Tax Liability | 69 |  |
State and Local Jurisdiction [Member] |  |  |
Taxes | 42 |  |
Interest | 14 |  |
Penalty | 13 |  |
Total Tax Liability | $ 69 |  |

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