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Note 6 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares 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) | 5,000,000 |  |
Treasury Stock, Value, Acquired, Cost Method | $ | $ (0) | $ 50 | $ 30
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) | 2,000,000 |  |
Stock Repurchased During Period, Shares (in shares) | 0 |  |
Common Stock and Class A Common Stock [Member] |  |  |
Stock Repurchased During Period, Shares (in shares) |  | 2,600,000 | 1,500,000
Treasury Stock, Value, Acquired, Cost Method | $ |  | $ 50 | $ 30

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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