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

Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation.

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