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Note I - Net Loss Per Share - Anti-dilutive Securities (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Antidilutive securities (in shares) 6,716,109 5,390,729 6,716,109 5,390,729
Share-Based Payment Arrangement [Member]        
Antidilutive securities (in shares) 2,463,509 1,169,379 2,463,509 1,169,379
Warrants to Purchase Common Stock [Member]        
Antidilutive securities (in shares) 4,252,600 4,221,350 4,252,600 4,221,350