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Note 6 - Segment Information - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Revenues from external customers $ 1,880,765     $ 1,896,133     $ 5,662,302 $ 5,795,159  
Cost of products sold 1,506,013     1,517,092     4,550,119 4,633,855  
Controllable expenses 224,799     218,009     675,449 668,658  
Allocated expenses 49,923     40,278     134,629 136,802  
Segment operating income (loss) 100,030     120,754     302,105 355,845  
Other Income (loss) (438)     149     (1,250) 370  
Interest income 586     479     1,409 780  
Interest expense 12,304     18,142     38,716 55,881  
Income taxes 20,136     23,819     62,204 71,422  
Net income (loss) 67,738 $ 72,989 $ 60,617 79,420 $ 78,783 $ 71,489 201,344 229,692  
Segment assets 4,553,062     4,553,061     4,553,062 4,553,061 $ 4,617,547
Capital expenditures 108,811     135,660     349,242 328,839  
Depreciation and amortization 18,155     19,134     53,022 51,376  
Operating Segments [Member] | Truck Segment [Member]                  
Revenues from external customers 1,876,793     1,891,777     5,650,359 5,782,579  
Cost of products sold 1,505,469     1,516,568     4,548,630 4,632,329  
Controllable expenses 223,311     216,711     670,744 664,143  
Allocated expenses 47,876     37,946     129,086 130,215  
Segment operating income (loss) 100,137     120,552     301,899 355,892  
Other Income (loss) (438)     149     (1,250) 370  
Interest income 586     479     1,409 780  
Interest expense 12,209     18,051     38,439 55,606  
Income taxes 20,136     23,820     62,204 71,422  
Net income (loss) 67,940     79,309     201,415 230,014  
Segment assets 4,492,954     4,494,444     4,492,954 4,494,444  
Capital expenditures 108,811     135,660     349,242 328,839  
Depreciation and amortization 18,006     19,006     52,585 50,991  
Operating Segments [Member] | Other Operating Segment [Member]                  
Revenues from external customers 3,972     4,356     11,943 12,580  
Cost of products sold 544     524     1,489 1,525  
Controllable expenses 1,488     1,298     4,705 4,515  
Allocated expenses 2,047     2,332     5,543 6,587  
Segment operating income (loss) (107)     202     206 (47)  
Other Income (loss) 0     0     0 0  
Interest income 0     0     0 0  
Interest expense 95     91     277 275  
Income taxes 0     0     0 0  
Net income (loss) (202)     111     (71) (322)  
Segment assets 60,108     58,617     60,108 58,617  
Capital expenditures 0     0     0 0  
Depreciation and amortization $ 149     $ 128     $ 437 $ 385