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Note 3 - Dividends (Details Textual) - $ / shares |  | 3 Months Ended
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Feb. 12, 2020 | Mar. 31, 2020 | Mar. 31, 2019
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.25 | $ 0.25 | $ 0.24
Dividends Payable, Date to be Paid | May 15, 2020 |  |
Dividends Payable, Date of Record | May 01, 2020 |  |

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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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Data Type: | num:perShareItemType
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Period Type: | duration

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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