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Note 6 - Share-based Compensation - RSU and PSA Activity (Details) - Restricted Stock Units and Performance Stock Awards [Member]
 9 Months Ended
Sep. 30, 2024
$ / shares
shares
Unvested RSUs and PSAs (in shares) | shares 226,391 [1]
Unvested RSUs and PSAs, weighted average grant date fair value (in dollars per share) | $ / shares $ 29.66
RSUs and PSAs granted (in shares) | shares 120,143 [1]
RSUs and PSAs granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 34.68
Unvested RSUs and PSAs canceled (in shares) | shares (3,197)
Unvested RSUs and PSAs canceled, weighted average grant date fair value (in dollars per share) | $ / shares $ 29.15
RSUs and PSAs vested (in shares) | shares (103,266) [2]
RSUs and PSAs vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 30.35 [2]
Unvested RSUs and PSAs (in shares) | shares 240,071 [1]
Unvested RSUs and PSAs, weighted average grant date fair value (in dollars per share) | $ / shares $ 31.89
[1] The number of PSAs disclosed in this table are at the target level of 100%.
[2] For the PSAs vested on April 1, 2024, the actual number of common shares that were issued was determined by multiplying the PSAs at the target level of 100%, as disclosed in this table, by a payout percentage based on the performance-based conditions achieved. The payout percentage was 123% for the 2021-2023 performance period, 110% for the 2022-2023 performance period, and 90% for the 2023 performance period.