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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement, Option [Member] |  |  |
Net share settlement (in shares) |  |  | 1,131,970
Shares transferred from treasury stock (in shares) | 1,146,368 | 1,623,740 |
Restricted Stock [Member] |  |  |
Net share settlement (in shares) | 60,101 | 27,890 | 40,578
Shares transferred from treasury stock (in shares) | 186,562 | 142,362 | 192,109
Other stock issuances (in shares) | 46,374 | 44,944 | 45,226
Treasury stock acquired (in shares) | 2,545,191 | 2,155,084 | 2,178,151

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