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Note 9 - Net Loss Per Share - Anti-dilutive Securities (Details) - shares
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Antidilutive securities (in shares) 4,868,735 4,576,190
Share-Based Payment Arrangement, Option [Member]    
Antidilutive securities (in shares) 2,444,011 2,148,732
Restricted Stock Units (RSUs) [Member]    
Antidilutive securities (in shares) 0 2,734
Warrant [Member]    
Antidilutive securities (in shares) 2,424,724 2,424,724