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Condensed Consolidated Statements of Changes In Stockholders' Equity (Unaudited) (Parentheticals) - shares | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Restricted Stock [Member] |  |
Treasury stock acquired (in shares) | 560,526 | 1,124,368
Net share settlement (in shares) | 37,683 |
Shares transferred from treasury stock (in shares) | 31,311 |
Other stock issuances (in shares) | 12,099 | 11,929
Share-based Payment Arrangement, Option [Member] |  |
Net share settlement (in shares) | 115,284 |
Shares transferred from treasury stock (in shares) |  | 449,007
Performance Shares [Member] |  |
Shares transferred from treasury stock (in shares) | 50,898 |

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