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Note 8 - Share-based Compensation - Restricted Stock Activity (Details) - Restricted Stock Units (RSUs) [Member]
 6 Months Ended
Jun. 30, 2021
$ / shares
shares
Unvested, number of units (in shares) | shares 3,377,097
Unvested, weighted average grant-date fair value (in dollars per share) | $ / shares $ 7.09
Granted, number of units (in shares) | shares 1,043,660
Granted, weighted average grant-date fair value (in dollars per share) | $ / shares $ 5.88
Vested and delivered, number of units (in shares) | shares (1,824,153)
Vested and delivered, weighted average grant-date fair value (in dollars per share) | $ / shares $ 2.98
Withheld as treasury stock, number of units (in shares) | shares (122,965) [1]
Withheld as treasury stock, weighted average grant-date fair value (in dollars per share) | $ / shares $ 4.91 [1]
Vested not delivered, number of units (in shares) | shares 570,335 [2]
Vested not delivered, weighted average grant-date fair value (in dollars per share) | $ / shares $ 2.70 [2]
Forfeited (in shares) | shares (200,404)
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares $ 4.20
Unvested, number of units (in shares) | shares (2,843,570)
Unvested, weighted average grant-date fair value (in dollars per share) | $ / shares $ 8.69
[1] As discussed in Note 7, Common stock, treasury stock and warrants, the increase in treasury stock was due to shares withheld to cover statutory withholding taxes upon the delivery of shares following vesting of RSUs. As of March 31, 2021, there were 4,055,011 outstanding shares of treasury stock.
[2] Vested not delivered represents vested RSUs with delivery deferred to a future time. For the three months ended March 31, 2021, there was a net decrease of 565,255 shares included in the vested not delivered balance as a result of the delivery of 650,333 shares, partially offset by the vesting of 85,078 shares with deferred delivery election. As of March 31, 2021, 1,696,746 outstanding RSUs were vested not delivered.