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Note 6 - Share-based Compensation - RSU and PSA Activity (Details) - Restricted Stock Units and Performance Stock Awards [Member]
 6 Months Ended
Jun. 30, 2025
$ / shares
shares
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
RSUs and PSAs granted (in shares) | shares 107,065 [1]
RSUs and PSAs granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 42.41
RSUs and PSAs vested (in shares) | shares (117,339) [2]
RSUs and PSAs vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 31.24 [2]
Unvested RSUs and PSAs (in shares) | shares 229,797 [1]
Unvested RSUs and PSAs, weighted average grant date fair value (in dollars per share) | $ / shares $ 37.12
[1] The number of PSAs disclosed in this table are at the target level of 100%.
[2] For the PSAs vested on March 31, 2025, 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 118% for the 2022-2024 performance period, 111% for the 2023-2024 performance period, and 133% for the 2024 performance period.