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Note 11 - Share-based Compensation - Restricted Stock Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Unvested, number of units (in shares) 4,223,156 3,111,321
Unvested, weighted average grant-date fair value (in dollars per share) $ 5.37 $ 8.03
Granted, number of units (in shares) 3,487,110 2,864,701
Granted, weighted average grant-date fair value (in dollars per share) $ 0.89 $ 1.44
Vested and delivered, number of units (in shares) 1,221,016 (1,120,046)
Vested and delivered, weighted average grant-date fair value (in dollars per share) $ 2.96 $ 3.55
Withheld as treasury stock (1), number of units (in shares) [1] 311,417 (208,329)
Withheld as treasury stock (1), weighted average grant-date fair value (in dollars per share) [1] $ 1.82 $ 4.56
Vested not delivered (2), number of units (in shares) [2] (39,592) 0
Vested not delivered (2), weighted average grant-date fair value (in dollars per share) [2] $ 2.85 $ 3.3
Forfeited, number of units (in shares) (1,749,241) (424,491)
Forfeited, weighted average grant-date fair value (in dollars per share) $ 1.2 $ 3.53
Vested and delivered, number of units (in shares) (1,221,016) 1,120,046
Withheld as treasury stock, number of units (1) (in shares) [1] (311,417) 208,329
Unvested, number of units (in shares) 4,389,000 4,223,156
Unvested, weighted average grant-date fair value (in dollars per share) $ 4.43 $ 5.37
[1] As discussed in Note 10, Common stock, treasury stock and warrants, the increase in treasury stock was primarily attributable to shares withheld to cover statutory withholding taxes upon the vesting of RSUs. As of December 31, 2023 and 2022, there were 4,611,569 and 4,300,152 outstanding shares of treasury stock, respectively.
[2] Vested not delivered represents vested RSUs with delivery deferred to a future time. During the year ended December 31, 2023, there was a 39,592 change in vested not delivered balance as a result of the timing of delivery of certain shares. During the year ended December 31, 2022, there was no net change in vested not delivered balance as a result of the timing of delivery of certain shares. As of December 31, 2023 and 2022, there were 1,739,592 and 1,691,666 outstanding RSUs included in vested not delivered, respectively