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Note 11 - Shareholders' Equity (Deficit) (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Reserved Shares Of Common Stock For Future Issuance [Table Text Block] |
Stock options outstanding |  |  | 15,255,154 |
Awards available to issue under the 2017 Plan |  |  | 8,802,249 |
Total shares reserved |  |  | 24,057,403 |

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