Note 16 - Segments - Segment Reporting Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues from external customers	$ 7,804,746	$ 7,925,024	$ 7,101,670
Cost of products sold	6,273,330	6,331,934	5,614,511
Controllable expenses	958,926	794,016	794,870
Allocated expenses	104,400	286,693	186,176
Segment operating income (loss)	468,090	512,381	506,113
Other Income	583	2,597	22,338
Interest income	1,166	777	639
Interest expense	72,024	53,694	19,763
Income taxes	92,845	114,000	117,242
Net income (loss)	304,970	348,061	392,085
Segment assets	4,617,547	4,364,241	3,821,066
Goodwill	427,493	420,708	416,363
Capital expenditures	433,047	368,881	243,060
Depreciation and amortization	68,549	59,830	55,665
Truck Segment [Member]
Revenues from external customers	7,788,842	7,909,230	7,084,849
Cost of products sold	6,271,327	6,329,629	5,611,521
Controllable expenses	952,973	789,109	790,854
Allocated expenses	96,159	278,117	177,059
Segment operating income (loss)	468,383	512,375	505,415
Other Income	583	2,597	22,338
Interest income	1,166	777	639
Interest expense	71,658	53,324	19,389
Income taxes	92,845	114,000	117,242
Net income (loss)	305,628	348,437	391,761
Segment assets	4,561,583	4,308,264	3,769,007
Goodwill	424,933	418,148	413,803
Capital expenditures	432,400	367,942	242,503
Depreciation and amortization	68,031	59,373	55,354
Other Operating Segment [Member]
Revenues from external customers	15,904	15,794	16,821
Cost of products sold	2,003	2,305	2,990
Controllable expenses	5,953	4,907	4,016
Allocated expenses	8,240	8,576	9,117
Segment operating income (loss)	(292)	6	698
Interest expense	366	370	374
Net income (loss)	(658)	(364)	324
Segment assets	55,964	55,977	52,059
Goodwill	2,560	2,560	2,560
Capital expenditures	647	939	557
Depreciation and amortization	$ 518	$ 457	$ 311