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Note 11 - Shareholders' Equity (Deficit) (Tables)
12 Months Ended
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