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Note 2 - Summary of Significant Accounting Policies - Antidilutive Securities (Details) - shares
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Antidilutive securities (in shares) 11,596,762 6,888,015
Share-Based Payment Arrangement, Option [Member]    
Antidilutive securities (in shares) 11,596,762 6,888,015