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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Payment Arrangement, Option [Member] |  |  |  |
Net share settlement (in shares) | 274,052 |  | 572,213 | 25,187
Shares transferred from treasury stock (in shares) |  | 492,135 |  | 1,308,469
Restricted Stock [Member] |  |  |  |
Net share settlement (in shares) | 1,204 | 288 | 57,020 |
Shares transferred from treasury stock (in shares) |  | 1,721 | 182,824 | 137,811
Other stock issuances (in shares) | 11,647 | 13,637 | 35,287 | 35,792
Treasury stock acquired (in shares) | 798,242 | 276,290 | 2,192,780 | 1,892,187
Shares transferred from treasury stock (in shares) | 1,294 |  |  |

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