Note 2 - Discontinued Operations (Details Textual) - Off-highway Business [Member] - Discontinued Operations, Disposed of by Sale [Member] - USD ($) $ in Millions		3 Months Ended
	Jan. 01, 2026	Mar. 31, 2026	Mar. 31, 2025
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		$ 1,191
Allison Transmission Holdings, Inc. [Member]
Disposal Group, Including Discontinued Operation, Consideration	$ 2,664
Disposal Group, Including Discontinued Operation, Consideration, Working Capital Adjustment	(30)
Disposal Group, Including Discontinued Operation, Consideration, Deferred	82
Other Accrued Liabilities, Current	82
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	$ 1,191
Transition Services Agreement, Period (Month)	24 months
Disposal Group, Including Discontinued Operation, Other Expense		$ 48