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Note 12 - Subsequent Event (Details Textual) - $ / shares |  | 3 Months Ended
--- | --- | ---
Aug. 02, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20
Subsequent Event [Member] |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.20 |  |  |  |

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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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- Details
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