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Note 8 - Share-based Compensation - Restricted Stock Activity (Details) - Restricted Stock Units (RSUs) [Member]
 6 Months Ended
Jun. 30, 2020
$ / shares
shares
Unvested, number of units (in shares) | shares 3,394,370
Unvested, weighted average grant-date fair value (in dollars per share) | $ / shares $ 8.03
Granted, number of units (in shares) | shares 1,545,032
Granted, weighted average grant-date fair value (in dollars per share) | $ / shares $ 2.03
Vested and delivered, number of units (in shares) | shares (1,376,581)
Vested and delivered, weighted average grant-date fair value (in dollars per share) | $ / shares $ 3.58
Withheld as treasury stock, number of units (in shares) | shares (190,326) [1]
Withheld as treasury stock, weighted average grant-date fair value (in dollars per share) | $ / shares $ 4.04 [1]
Vested not delivered, number of units (in shares) | shares 525,334 [2]
Vested not delivered, weighted average grant-date fair value (in dollars per share) | $ / shares $ 2.84 [2]
Forfeited, number of units (in shares) | shares (161,506)
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares $ 2.77
Unvested, number of units (in shares) | shares 3,736,323
Unvested, weighted average grant-date fair value (in dollars per share) | $ / shares $ 6.83
[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 June 30, 2020, there were 3,616,398 outstanding shares of treasury stock.
[2] Vested not delivered represents vested RSUs with delivery deferred to a future time. For the six months ended June 30, 2020, there was a net decrease of 525,334 shares included in the vested not delivered balance as a result of the delivery of 655,333 shares, partially offset by the vesting of 129,999 shares with deferred delivery election. As of June 30, 2020, 2,262,001 outstanding RSUs were vested not delivered.