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Note 12 - Net Loss Per Share of Common Stock - Antidilutive Securities (Details) - shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Share-Based Payment Arrangement, Option [Member]    
Anti-dilutive securities (in shares) 4,570,432 2,439,253
Common Stock Warrants [Member]    
Anti-dilutive securities (in shares) 50,029,052 0