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Note 8 - Stock-based Compensation - RSU Stock-based Payment Awards (Details) - Restricted Stock Units (RSUs) [Member]
 9 Months Ended
Sep. 30, 2022
$ / shares
shares
Unvested, shares (in shares) | shares 5,509
Unvested, Weighted-average grant date fair value (in dollars per share) | $ / shares $ 34.78
Vested, shars (in shares) | shares (1,347) [1]
Vested, Weighted-average grant date fair value (in dollars per share) | $ / shares $ 30.93
Unvested, shares (in shares) | shares 4,162
Unvested, Weighted-average grant date fair value (in dollars per share) | $ / shares $ 36.02
[1] The RSUs vested during the nine months ended September 30, 2022 were settled on a hybrid basis. The Company withheld 496 shares of common stock and, in lieu of delivering such shares, paid the RSU holder an amount in cash equal to the fair market value of such shares on the vesting date, representing the holder's approximate tax liability associated with the vesting.