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Note 6 - Segment Information - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Revenues from external customers $ 1,850,830 $ 1,871,999  
Cost of products sold 1,493,070 1,482,124  
Operating income 91,869 110,610  
Other Income (440) 177  
Income taxes 17,949 21,325  
Net income 60,617 71,489  
Segment assets 4,687,941   $ 4,617,547
Depreciation and amortization 17,256 15,750  
Operating Segments [Member]      
Revenues from external customers 1,850,830 1,871,999  
Cost of products sold 1,493,070 1,482,124  
Controllable expenses 194,156 201,510  
Allocated expenses 71,735 77,754  
Operating income 91,869 110,610  
Other Income (440) 177  
Interest income 674 200  
Interest expense 13,538 18,174  
Income taxes 17,949 21,325  
Net income 60,617 71,489  
Segment assets 4,687,941 4,629,006  
Capital expenditures 113,314 93,130  
Depreciation and amortization 17,256 15,750  
Truck Segment [Member] | Operating Segments [Member]      
Revenues from external customers 1,847,106 1,876,325  
Cost of products sold 1,492,706 1,481,654  
Controllable expenses 191,190 198,366  
Allocated expenses 71,336 77,241  
Operating income 91,874 119,065  
Other Income (440) 177  
Interest income 674 200  
Interest expense 13,447 18,082  
Income taxes 17,949 21,325  
Net income 60,712 80,035  
Segment assets 4,628,663 4,570,652  
Capital expenditures 113,314 93,056  
Depreciation and amortization 17,116 15,622  
Other Operating Segment [Member] | Operating Segments [Member]      
Revenues from external customers 3,723 (4,326)  
Cost of products sold 363 470  
Controllable expenses 2,965 3,145  
Allocated expenses 399 514  
Operating income (5) (8,454)  
Other Income 0 0  
Interest income 0 0  
Interest expense 91 92  
Income taxes 0 0  
Net income (96) (8,546)  
Segment assets 59,277 58,354  
Capital expenditures 0 74  
Depreciation and amortization $ 140 $ 128