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Note 6 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2024 USD ($) $ / shares | Mar. 31, 2024 USD ($) $ / shares | Sep. 30, 2023 USD ($) $ / shares | Jun. 30, 2023 USD ($) $ / shares | Mar. 31, 2023 USD ($) $ / shares | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) $ / shares | Dec. 31, 2023 shares
Capital Units, Authorized (in shares) | shares | 245,000,000 |  |  |  |  |  | 245,000,000 |  |
Common Stock, Shares Authorized (in shares) | shares | 200,000,000 |  |  |  |  |  | 200,000,000 |  |
Preferred Stock, Shares Authorized (in shares) | shares | 20,000,000 |  |  |  |  |  | 20,000,000 |  |
Common Stock, Voting Rights, Votes Per Share | 1 |  |  |  |  |  | 1 |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.08 |  |  | $ 0.08 |  |  | $ 0.24 | $ 0.24 |
Dividends, Common Stock | $ | $ 8 | $ 8 | $ 8 | $ 8 | $ 7 | $ 7 | $ 24 | $ 22 |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares | 12,700,000 |  |  |  |  |  | 12,700,000 |  |
O 2024 Q1 Dividends [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  | $ 0.08 |  |  |  |  |  |
O 2024 Q2 Dividends [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  | $ 0.08 |  |  |  |  |  |  |
O 2023 Q1 Dividends [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  |  |  | $ 0.08 |  |  |
O 2023 Q2 Dividends [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  |  | $ 0.08 |  |  |  |
O 2024 Q3 Dividends [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.08 |  |  |  |  |  |  |  |
O 2023 Q3 Dividends [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  | $ 0.08 |  |  |  |  |
Class A Common Stock (No Par Value) [Member] |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) | shares | 25,000,000 |  |  |  |  |  | 25,000,000 |  | 25,000,000
Common Stock, Voting Rights, Votes Per Share | 10 |  |  |  |  |  | 10 |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares | 1,200,000 |  |  |  |  |  | 1,200,000 |  |
Class A Common Stock (No Par Value) [Member] | O 2024 Q1 Dividends [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  | $ 0.08 |  |  |  |  |  |
Class A Common Stock (No Par Value) [Member] | O 2024 Q2 Dividends [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  | $ 0.08 |  |  |  |  |  |  |
Class A Common Stock (No Par Value) [Member] | O 2023 Q1 Dividends [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  |  |  | $ 0.08 |  |  |
Class A Common Stock (No Par Value) [Member] | O 2023 Q2 Dividends [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  |  | $ 0.08 |  |  |  |
Class A Common Stock (No Par Value) [Member] | O 2024 Q3 Dividends [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.08 |  |  |  |  |  |  |  |

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