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Note 9 - Share-based Compensation - Restricted Stock Activity (Details) - Restricted Stock Units (RSUs) [Member]
 9 Months Ended
Sep. 30, 2024
$ / shares
shares
Unvested, number of units (in shares) | shares 731,538
Unvested, weighted average grant-date fair value (in dollars per share) | $ / shares $ 25.95
Granted, number of units (in shares) | shares 697,211
Granted, weighted average grant-date fair value (in dollars per share) | $ / shares $ 3.62
Vested and delivered, number of units (in shares) | shares (305,348)
Vested and delivered, weighted average grant-date fair value (in dollars per share) | $ / shares $ 10.4
Withheld as treasury stock (1), number of units (in shares) | shares 0 [1]
Withheld as treasury stock (1), weighted average grant-date fair value (in dollars per share) | $ / shares $ 0 [1]
Vested not delivered (2), number of units (in shares) | shares 3,833 [2]
Vested not delivered (2), weighted average grant-date fair value (in dollars per share) | $ / shares $ 10.6 [2]
Forfeited, number of units (in shares) | shares (133,611)
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares $ 11.59
Unvested, number of units (in shares) | shares (993,623)
Unvested, weighted average grant-date fair value (in dollars per share) | $ / shares $ 17.4
[1] As discussed in Note 8, Equity, the treasury stock was related to shares withheld to cover statutory withholding taxes upon the delivery of shares following the vesting of RSUs. As of September 30, 2024, there were 768,595 outstanding shares of treasury stock.
[2] Vested not delivered represents vested RSUs with delivery deferred to a future time. For the nine months ended September 30, 2024, there was a change in the vested not delivered balance due to a net 568 shares that were deferred due to timing of delivery of certain shares, along with 3,265 shares that elected deferred delivery. As of September 30, 2024, 286,099 outstanding RSUs were vested not delivered.