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Note 4 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Revenue |  | $ 302,854 | $ 287,497 | $ 572,209 | $ 566,260 | $ 572,209 | $ 566,260
Salaries, wages, and related expenses |  | 109,148 | 106,373 | 214,100 | 206,708 |  |
Fuel expense |  | 27,989 | 29,093 | 56,157 | 60,045 |  |
Operations and maintenance |  | 17,066 | 15,552 | 32,816 | 29,148 |  |
Revenue equipment rentals and purchased transportation |  | 76,791 | 62,755 | 133,596 | 129,506 |  |
Operating taxes and licenses |  | 3,436 | 2,283 | 7,022 | 5,644 |  |
Insurance and claims |  | 17,307 | 17,148 | 32,590 | 32,538 |  |
Communications and utilities |  | 1,481 | 1,272 | 2,949 | 2,675 |  |
General supplies and expenses |  | 14,657 | 14,477 | 28,252 | 35,307 |  |
Loss on disposition of property and equipment, net |  | 295 | 837 | 621 | 1,539 |  |
Segment operating expenses |  | 291,291 | 271,920 | 553,019 | 546,348 |  |
Segment operating income |  | 11,563 | 15,577 | 19,190 | 19,912 | 19,190 | 19,912
Other (2) |  | (8,494) | (16,263) |  |  | (13,888) | (36,740)
Interest expense, net |  | (2,470) | (3,799) | (5,327) | (7,137) | (5,327) | (7,137)
Income from equity method investment |  | 4,268 | 4,094 | 8,044 | 7,770 | 8,044 | 7,770
Income before income taxes |  | 13,361 | 15,872 | 21,907 | 20,545 | 21,907 | 20,545
Cargo and Freight [Member] |  |  |  |  |  |  |
Revenue |  | 276,532 | 256,512 | 519,751 | 504,197 |  |
Fuel Surcharge [Member] |  |  |  |  |  |  |
Revenue |  | 26,322 | 30,985 | $ 52,458 | $ 62,063 |  |
Operating Segments [Member] |  |  |  |  |  |  |
Revenue |  | 302,854 |  |  |  |  |
Segment operating expenses |  | 282,797 | 255,657 |  |  | 539,131 | 509,608
Segment operating income |  | 20,057 | 31,840 |  |  | 33,078 | 56,652
Operating Segments [Member] | Cargo and Freight [Member] |  |  |  |  |  |  |
Revenue |  | 276,532 | 256,512 |  |  | 519,751 | 504,197
Operating Segments [Member] | Fuel Surcharge [Member] |  |  |  |  |  |  |
Revenue | [1] | 26,322 | 30,985 |  |  | 52,458 | 62,063
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |  |  |  |  |
Interest expense, net |  |  | (3,799) |  |  |  |
Highway Services [Member] |  |  |  |  |  |  |
Revenue |  |  | 108,010 |  |  | 191,993 | 213,481
Highway Services [Member] | Operating Segments [Member] |  |  |  |  |  |  |
Revenue |  | 97,300 |  |  |  |  |
Salaries, wages, and related expenses |  | 32,153 | 35,135 |  |  | 63,642 | 69,922
Fuel expense |  | 14,335 | 16,740 |  |  | 29,270 | 34,559
Operations and maintenance |  | 10,322 | 10,004 |  |  | 21,165 | 19,868
Revenue equipment rentals and purchased transportation |  | 17,136 | 17,411 |  |  | 33,697 | 34,321
Operating taxes and licenses |  | 341 | 479 |  |  | 677 | 952
Insurance and claims |  | 6,743 | 6,776 |  |  | 13,317 | 13,329
Communications and utilities |  | 0 | 0 |  |  | 1 | 1
General supplies and expenses |  | 225 | 219 |  |  | 469 | 448
Depreciation and amortization |  | 1 | 8 |  |  | 3 | 16
Loss on disposition of property and equipment, net |  | 0 |  |  |  | 0 | 0
Total allocated overhead |  | 8,578 | 8,407 |  |  | 16,696 | 16,366
Segment operating expenses |  | 89,834 | 95,179 |  |  | 178,937 | 189,782
Segment operating income |  | 7,466 | 12,831 |  |  | 13,056 | 23,699
Highway Services [Member] | Operating Segments [Member] | Cargo and Freight [Member] |  |  |  |  |  |  |
Revenue |  | 83,229 | 88,918 |  |  | 163,478 | 175,518
Highway Services [Member] | Operating Segments [Member] | Fuel Surcharge [Member] |  |  |  |  |  |  |
Revenue | [1] | 14,071 | 19,092 |  |  | 28,515 | 37,963
Dedicated [Member] |  |  |  |  |  |  |
Revenue |  |  | 93,465 |  |  | 195,886 | 177,947
Dedicated [Member] | Operating Segments [Member] |  |  |  |  |  |  |
Revenue |  | 102,277 |  |  |  |  |
Salaries, wages, and related expenses |  | 42,041 | 36,119 |  |  | 81,400 | 67,612
Fuel expense |  | 13,552 | 12,118 |  |  | 26,662 | 24,914
Operations and maintenance |  | 11,300 | 9,247 |  |  | 21,915 | 18,112
Revenue equipment rentals and purchased transportation |  | 9,230 | 7,399 |  |  | 17,574 | 15,273
Operating taxes and licenses |  | 652 | 298 |  |  | 1,260 | 541
Insurance and claims |  | 5,170 | 4,066 |  |  | 10,163 | 7,654
Communications and utilities |  | 224 | 99 |  |  | 387 | 175
General supplies and expenses |  | 631 | 547 |  |  | 1,134 | 1,119
Depreciation and amortization |  | 4,222 | 2,874 |  |  | 8,289 | 5,240
Loss on disposition of property and equipment, net |  | 207 | (85) |  |  | 288 | (38)
Total allocated overhead |  | 8,835 | 8,477 |  |  | 18,554 | 16,716
Segment operating expenses |  | 96,064 | 81,159 |  |  | 187,626 | 157,318
Segment operating income |  | 6,213 | 12,306 |  |  | 8,260 | 20,629
Dedicated [Member] | Operating Segments [Member] | Cargo and Freight [Member] |  |  |  |  |  |  |
Revenue |  | 90,166 | 81,853 |  |  | 172,246 | 154,448
Dedicated [Member] | Operating Segments [Member] | Fuel Surcharge [Member] |  |  |  |  |  |  |
Revenue | [1] | 12,111 | 11,612 |  |  | 23,640 | 23,499
Managed Freight [Member] |  |  |  |  |  |  |
Revenue |  |  | 60,366 |  |  | 134,400 | 123,283
Managed Freight [Member] | Operating Segments [Member] |  |  |  |  |  |  |
Revenue |  | 77,550 |  |  |  |  |
Salaries, wages, and related expenses |  | 2,844 | 2,086 |  |  | 5,122 | 4,063
Fuel expense |  | 0 | 0 |  |  | 0 | 0
Operations and maintenance |  | 563 | 35 |  |  | 506 | 180
Revenue equipment rentals and purchased transportation |  | 66,558 | 50,968 |  |  | 114,189 | 105,571
Operating taxes and licenses |  | 9 | 10 |  |  | 66 | 23
Insurance and claims |  | 25 | 29 |  |  | 157 | 248
Communications and utilities |  | 8 | 5 |  |  | 18 | 11
General supplies and expenses |  | 885 | 754 |  |  | 1,675 | 1,500
Depreciation and amortization |  | 22 | 21 |  |  | 43 | 42
Loss on disposition of property and equipment, net |  | 0 | 0 |  |  | 0 | 0
Total allocated overhead |  | 2,174 | 2,650 |  |  | 4,622 | 5,107
Segment operating expenses |  | 73,088 | 56,558 |  |  | 126,398 | 116,745
Segment operating income |  | 4,462 | 3,808 |  |  | 8,002 | 6,538
Managed Freight [Member] | Operating Segments [Member] | Cargo and Freight [Member] |  |  |  |  |  |  |
Revenue |  | 77,550 | 60,366 |  |  | 134,400 | 123,283
Managed Freight [Member] | Operating Segments [Member] | Fuel Surcharge [Member] |  |  |  |  |  |  |
Revenue | [1] | 0 | 0 |  |  | 0 | 0
Warehousing [Member] |  |  |  |  |  |  |
Revenue |  |  | 25,656 |  |  | 49,930 | 51,549
Warehousing [Member] | Operating Segments [Member] |  |  |  |  |  |  |
Revenue |  | 25,727 |  |  |  |  |
Salaries, wages, and related expenses |  | 12,350 | 11,563 |  |  | 23,777 | 23,682
Fuel expense |  | 156 | 371 |  |  | 331 | 807
Operations and maintenance |  | 1,534 | 1,378 |  |  | 2,683 | 2,718
Revenue equipment rentals and purchased transportation |  | 1,173 | 1,129 |  |  | 2,251 | 2,430
Operating taxes and licenses |  | 559 | 750 |  |  | 1,349 | 1,287
Insurance and claims |  | 239 | 202 |  |  | 446 | 399
Communications and utilities |  | 227 | 218 |  |  | 467 | 444
General supplies and expenses |  | 4,742 | 4,353 |  |  | 9,146 | 8,350
Depreciation and amortization |  | 476 | 456 |  |  | 957 | 835
Loss on disposition of property and equipment, net |  | 0 | 0 |  |  | 0 | 0
Total allocated overhead |  | 2,355 | 2,341 |  |  | 4,763 | 4,811
Segment operating expenses |  | 23,811 | 22,761 |  |  | 46,170 | 45,763
Segment operating income |  | 1,916 | 2,895 |  |  | 3,760 | 5,786
Warehousing [Member] | Operating Segments [Member] | Cargo and Freight [Member] |  |  |  |  |  |  |
Revenue |  | 25,587 | 25,375 |  |  | 49,627 | 50,948
Warehousing [Member] | Operating Segments [Member] | Fuel Surcharge [Member] |  |  |  |  |  |  |
Revenue | [1] | $ 140 | $ 281 |  |  | $ 303 | $ 601
[1] | The chief operating decision maker does not receive fuel surcharge revenue and fuel expense individually, but is provided with fuel expense less fuel surcharge revenue (other than the fuel surcharge revenue we reimburse to independent contractors and other third parties which is included in purchased transportation), which we refer to as net fuel expense. The chief operating decision maker uses net fuel expense to measure the effectiveness of our fuel surcharge program.

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