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Note 9 - Stockholders' Equity - RSU and PSU Activity (Details) - RSUs and PSUs [Member]
 12 Months Ended
Dec. 31, 2024
$ / shares
shares
Unvested as at the beginning of the year (in shares) | shares 1,281,751
Unvested as at the beginning of the year (in dollars per share) | $ / shares $ 24.97
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares 917,455
Granted, weighted average fair value (in dollars per share) | $ / shares $ 20.14
Vested (in shares) | shares (405,205)
Vested, weighted average fair value (in dollars per share) | $ / shares $ 31.27
Forfeited (in shares) | shares (190,493)
Forfeited or expired, weighted average fair value (in dollars per share) | $ / shares $ 21.55
Unvested at the end of the year (in shares) | shares 1,603,508
Unvested at the end of the year (in dollars per share) | $ / shares $ 21.01