Note 10 - Commitments and Contingencies (Details Textual) - Forecast [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Expected Capital Expenditures To Be Incurred, Net				$ 73	$ 201
Expected Incentive Payments to be Received		$ 43	$ 59
Additional Expected Incentive Payments to be Received	$ 20

Expected capital expenditures to be incurred, net of proceeds from property sales and incentive payments received.

No definition available.

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