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Note 8 - Share-based Payment Awards - Schedule of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2024
Balance, Options (in shares) 4,839,226
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 4.57
Issued, Options (in shares) 1,471,118
Issued, Weighted Average Exercise Price (in dollars per share) $ 4.41
Exercised, Options (in shares) (2,500)
Exercised, Weighted Average Exercise Price (in dollars per share) $ 2.97
Forfeited/Cancelled, Options (in shares) (25,771)
Forfeited/Cancelled, Weighted Average Exercise Price (in dollars per share) $ 4.38
Balance, Options (in shares) 6,282,073
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 4.54
Outstanding, Weighted Average Remaining Contractual Term (Year) 7 years 4 months 24 days
Outstanding, Aggregate Intrinsic Value $ 634
Exercisable, Options (in shares) 3,866,990
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 4.72
Exercisable, Weighted Average Remaining Contractual Term (Year) 6 years 6 months
Exercisable, Aggregate Intrinsic Value $ 604
Vested and expected to vest, Options (in shares) 6,282,073
Vested and expected to vest, Weighted Average Exercise Price (in dollars per share) $ 4.54
Vested and expected to vest, Weighted Average Remaining Contractual Term (Year) 7 years 4 months 24 days
Vested and expected to vest at June 30, 2024 $ 634