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Note 9 - Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Oct. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.027 | $ 0.24 | $ 0.66 | $ 0.633
Payments of Ordinary Dividends, Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,563 | $ 54,735 | $ 52,366
Paid Quarterly [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.04 |  | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.027 |  |  |  |
Payments of Ordinary Dividends, Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,600 | $ 54,700 | $ 52,400
Special Dividend [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.50 |  |  |  |  |  | $ 0.50 |  |  |  |  |  |  |  |  |  |

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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 https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585 + Details
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