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Note 6 - Stockholders' Equity (Details Textual) | 12 Months Ended
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Dec. 31, 2024 $ / shares shares | Dec. 31, 2023 $ / shares 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 | $ 0.32 | $ 0.32 | $ 0.32
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 3,000,000 |  |
Capital Accumulation Plan [Member] |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 10,000,000 |  |
O 2024 A Dividends [Member] |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares | $ 0.32 |  |
O 2023 A Dividends [Member] |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares |  | $ 0.32 |
O 2022 A Dividends [Member] |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares |  |  | $ 0.32
Class A Common Stock (No Par Value) [Member] |  |  |
Common Stock, Shares Authorized (in shares) | 25,000,000 | 25,000,000 |
Common Stock, Voting Rights, Votes Per Share | 10 |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 1,000,000 |  |

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