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Note 5 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.10 |
Treasury Stock, Value, Acquired, Cost Method |  | $ 25
Treasury Stock, Shares, Acquired (in shares) |  | 1,483,742
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 102 |

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