Note 12 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%	21.00%
Effective Income Tax Rate Reconciliation, Percent		25.00%	(8.00%)	25.00%	4.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent				5.00%	3.00%
Effective Income Tax Rate Reconciliation, Deduction, Percent				1.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent				2.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent					7.00%
Effective Income Tax Rate Reconciliation, Discrete Item, Percent			13.00%		13.00%
Income Taxes Paid, Net				$ 130
State and Local Jurisdiction [Member]
Operating Loss Carryforwards		$ 282		282
Operating Loss Carryforwards That Will Not Be Realized		$ 201		$ 201
Forecast [Member] | Minimum [Member]
Income Taxes Paid, Net	$ 3