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Note 1 - Description of Business and Basis of Presentation (Details Textual) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Retained Earnings (Accumulated Deficit), Total | $ 137,986 | $ 163,836
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |
Retained Earnings (Accumulated Deficit), Total | $ (100) |

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