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Note 11 - Share-based Compensation - Restricted Stock Unit and Performance Award Activity (Details)
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Unvested, number of shares (in shares) | shares 1,332,884
Unvested, weighted average grant-date fair value per share (in dollars per share) | $ / shares $ 1.86
Granted, number of shares (in shares) | shares 393,592
Granted, weighted average grant-date fair value per share (in dollars per share) | $ / shares $ 4.82
Vested, number of shares (in shares) | shares (691,994)
Vested, weighted average grant-date fair value per share (in dollars per share) | $ / shares $ 1.93
Forfeited, number of shares (in shares) | shares (108,144)
Forfeited, weighted average grant-date fair value per share (in dollars per share) | $ / shares $ 2.95
Unvested, number of shares (in shares) | shares 926,338
Unvested, weighted average grant-date fair value per share (in dollars per share) | $ / shares $ 2.74