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Note I - Net Income (Loss) Per Share - Anti-dilutive Securities (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Antidilutive securities (in shares) 6,782,169 4,999,758 6,782,169 4,999,758
Share-Based Payment Arrangement [Member]        
Antidilutive securities (in shares) 2,529,569 414,869 2,529,569 414,869
Warrants to Purchase Common Stock [Member]        
Antidilutive securities (in shares) 4,252,600 4,584,889 4,252,600 4,584,889