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Note 6 - Net Loss Per Common Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 10,283,000 5,534,000 9,388,000 5,237,000