Note 5 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Leasehold Improvements, Gross	$ 9	$ 9

Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482099/360-10-50-1

Name:	us-gaap_LeaseholdImprovementsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant