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Note 6 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2022 USD ($) $ / shares | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Sep. 30, 2023 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) $ / shares | Dec. 31, 2022 shares
Capital Units, Authorized (in shares) |  |  |  |  |  |  |  |  | 245,000,000
Common Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  | 200,000,000
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  | 20,000,000
Common Stock, Voting Rights, Votes Per Share |  |  |  |  |  |  |  |  | 1
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares | $ 0.08 |  |  | $ 0.08 |  |  | $ 0.24 | $ 0.24 |
Dividends, Common Stock | $ | $ 8 | $ 7 | $ 7 | $ 7 | $ 8 | $ 8 | $ 22 | $ 23 |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 7,300,000 |  |  |  |  |  | 7,300,000 |  |
Class A Common Stock (No Par Value) [Member] |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) | 25,000,000 |  |  |  |  |  | 25,000,000 |  | 25,000,000
Common Stock, Voting Rights, Votes Per Share |  |  |  |  |  |  |  |  | 10
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.08 |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 2,100,000 |  |  |  |  |  | 2,100,000 |  |

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