Note 5 - Fair Value Measurement (Details Textual) - USD ($) $ in Billions	Sep. 30, 2023	Dec. 31, 2022
Long-Term Debt	$ 6.2	$ 6.5
Long-Term Debt, Fair Value	$ 5.3	$ 5.7

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant