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Consolidated Statements of Common Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Retained Earnings [Member] |  |  |  |
Dividends declared per common share (in dollars per share) | $ 0.37 | $ 0.35 |  |
Dividends declared per common share (in dollars per share) |  |  | $ 0.74 | $ 0.70

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120397183&loc=d3e187085-122770 + Details
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