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Note 6 - Share-based Compensation - RSU and PSA Activity (Details) - Restricted Stock Units and Performance Stock Awards [Member]
 3 Months Ended
Mar. 31, 2022
$ / shares
shares
Unvested RSUs and PSAs (in shares) | shares 161,131 [1]
Unvested RSUs and PSAs, weighted average grant date fair value (in dollars per share) | $ / shares $ 30.26
RSUs and PSAs vested (in shares) | shares (68,581) [1],[2]
RSUs and PSAs vested (in dollars per share) | $ / shares $ 29.29 [2]
Unvested RSUs and PSAs (in shares) | shares 92,550 [1]
Unvested RSUs and PSAs, weighted average grant date fair value (in dollars per share) | $ / shares $ 30.98
[1] The number of PSAs disclosed in this table are at the target level of 100%.
[2] For the PSAs vested on March 31, 2022, the actual number of common shares that were issued was determined by multiplying the PSAs by a payout percentage based on the performance-based conditions achieved. The payout percentage was 141% for the 2020-2021 performance period and 93% for the 2021 performance period.