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Note 1 - Basis of Presentation and Recent Accounting Pronouncements (Details Textual) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024 | Feb. 26, 2021
--- | --- | --- | ---
Cash and cash equivalents | $ 155 | $ 201 |
Short-term borrowings and current portion of long-term debt | 479 | $ 1 |
Series B Preferred Stock [Member] |  |  |
Embedded Derivative, Fair Value of Embedded Derivative Liability | 99 |  | $ 1
Short-term borrowings and current portion of long-term debt | 477 |  |
Letters of Credit Outstanding, Amount | 24 |  |
UNITED STATES |  |  |
Cash and cash equivalents | $ 70 |  |

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