Note 6 - Valuation Accounts - Valuation and Allowance Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Parts Inventory [Member]
Balance	$ 9,165	$ 9,423	$ 7,460
Net Charged to Costs and Expenses	6,411	6,274	7,378
Net Write-Offs	(7,879)	(6,532)	(5,415)
Balance End of Year	7,697	9,165	9,423
Commercial Vehicle Inventory [Member]
Balance	12,203	7,065	919
Net Charged to Costs and Expenses	18,242	11,191	13,653
Net Write-Offs	(20,620)	(6,053)	(7,507)
Balance End of Year	$ 9,825	$ 12,203	$ 7,065