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Note 11 - Share-based Compensation - Restricted Stock Unit and Performance Award Activity (Details)
3 Months Ended
Mar. 31, 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 80,014
Granted, weighted average grant-date fair value per share (in dollars per share) | $ / shares $ 2.06
Vested, number of shares (in shares) | shares (241,805)
Vested, weighted average grant-date fair value per share (in dollars per share) | $ / shares $ 2.14
Unvested, number of shares (in shares) | shares 1,171,093
Unvested, weighted average grant-date fair value per share (in dollars per share) | $ / shares $ 1.84