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Note 8 - Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.24 | $ 0.24 | $ 0.24
Payments of Ordinary Dividends, Common Stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,540 | $ 19,509 | $ 19,563
O 2024 Q1 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  | $ 0.06 |  |  |  |  |  |  |  |  |  |  |
O 2024 Q2 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  | $ 0.06 |  |  |  |  |  |  |  |  |  |  |  |
O 2024 Q3 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.06 |  |  |  |  |  |  |  |  |  |  |  |  |
O 2024 Q4 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |
O 2023 Q1 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  | $ 0.06 |  |  |  |  |  |  |
O 2023 Q2 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  | $ 0.06 |  |  |  |  |  |  |  |
O 2023 Q3 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  | $ 0.06 |  |  |  |  |  |  |  |  |
O 2023 Q4 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  | $ 0.06 |  |  |  |  |  |  |  |  |  |
O 2022 Q1 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  |  |  |  | $ 0.06 |  |  |
O 2022 Q2 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  |  |  | $ 0.06 |  |  |  |
O 2022 Q3 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  |  | $ 0.06 |  |  |  |  |
O 2022 Q4 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  | $ 0.06 |  |  |  |  |  |

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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 -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 + 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 -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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