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Note 9 - Stockholders' Equity - Summary of Restricted Stock Units Activity (Details) - RSUs and PSUs [Member]
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Unvested, number (in shares) | shares 732,564
Unvested, weighted average fair value (in dollars per share) | $ / shares $ 30.11
Granted, number (in shares) | shares 479,171
Granted, weighted average fair value (in dollars per share) | $ / shares $ 29.47
Vested, number (in shares) | shares (317,430)
Vested, weighted average fair value (in dollars per share) | $ / shares $ 31.30
Forfeited (in shares) | shares (51,357)
Forfeited (in dollars per share) | $ / shares $ 29.70
Unvested, number (in shares) | shares 842,948
Unvested, weighted average fair value (in dollars per share) | $ / shares $ 29.30