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Note 7 - Net Loss Per Share (Details Textual) - shares
9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 15,402,915 14,346,415 15,442,915 3,778,931