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Note 9 - Shareholders' Equity, Redeemable Convertible Preferred Stock, Options and Warrants - Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Outstanding, number (in shares)
Outstanding, weighted average grant date fair value (in dollars per share)
Granted, number (in shares) 7,250,000
Granted, weighted average grant date fair value (in dollars per share) $ 0.04
Exercised, number (in shares) (250,000)
Exercised, weighted average grant date fair value (in dollars per share) $ 0.04
Forfeited, number (in shares)
Forfeited, weighted average grant date fair value (in dollars per share)
Outstanding, number (in shares) 7,000,000
Outstanding, weighted average grant date fair value (in dollars per share)