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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Stockholders' Equity [Abstract] |  |  |
Shares of common stock issued under compensation plans | 1,329,957 | 964,053 | 944,504
Shares of common stock issued to settle warrants that have reached their expiration |  | 92,998 | 47,868
Dividends on common stock, per share amount | $ 0.26 | $ 0.24 | $ 0.22

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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