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Note 8 - Share-based Compensation - Restricted Stock Activity (Details)
 9 Months Ended
Sep. 30, 2020
$ / shares
shares
Forfeited, number of options (in shares) | shares (59,000)
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares
Restricted Stock Units (RSUs) [Member]  
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 1,638,532
Granted, weighted average grant-date fair value (in dollars per share) | $ / shares $ 2.02
Vested and delivered, number of units (in shares) | shares (1,407,714)
Vested and delivered, weighted average grant-date fair value (in dollars per share) | $ / shares $ 3.61
Withheld as treasury stock, number of units (in shares) | shares (210,683) [1]
Withheld as treasury stock, weighted average grant-date fair value (in dollars per share) | $ / shares $ 4.13 [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 options (in shares) | shares (334,991)
Forfeited, weighted average grant-date fair value (in dollars per share) | $ / shares $ 2.91
Unvested, number of units (in shares) | shares 3,604,848
Unvested, weighted average grant-date fair value (in dollars per share) | $ / shares $ 6.91
[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 September 30, 2020, there were 3,936,755 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, 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 September 30, 2020, 2,262,001 outstanding RSUs were vested not delivered.