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Note 4 - Segment Information - Segment Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Revenue |  | $ 296,889,000 | $ 287,885,000 | $ 869,098,000 | $ 854,145,000
Salaries, wages, and related expenses |  | 109,745,000 | 110,815,000 | 323,845,000 | 317,523,000
Fuel expense |  | 29,506,000 | 28,545,000 | 85,663,000 | 88,590,000
Operations and maintenance |  | 19,352,000 | 17,690,000 | 52,168,000 | 46,838,000
Revenue equipment rentals and purchased transportation |  | 72,908,000 | 64,434,000 | 206,504,000 | 193,940,000
Operating taxes and licenses |  | 3,304,000 | 3,227,000 | 10,326,000 | 8,871,000
Insurance and claims |  | 14,179,000 | 12,241,000 | 46,769,000 | 44,779,000
Communications and utilities |  | 1,631,000 | 1,330,000 | 4,580,000 | 4,005,000
General supplies and expenses |  | 15,872,000 | 11,937,000 | 44,124,000 | 47,244,000
Loss on disposition of property and equipment, net |  | (487,000) | 209,000 | 134,000 | 1,748,000
Segment operating expenses |  | 288,963,000 | 271,650,000 | 841,982,000 | 817,998,000
Subtotal operating income |  | 7,926,000 | 16,235,000 | 27,116,000 | 36,147,000
Other (2) |  | (6,763,000) | (12,528,000) | (20,564,000) | (49,267,000)
Interest expense, net |  | (3,468,000) | (3,204,000) | (8,795,000) | (10,341,000)
Income from equity method investment |  | 3,578,000 | 3,993,000 | 11,622,000 | 11,763,000
Income before income taxes |  | 8,036,000 | 17,024,000 | 29,943,000 | 37,569,000
Cargo and Freight [Member] |  |  |  |  |
Revenue |  | 268,840,000 | 258,599,000 | 788,591,000 | 762,796,000
Fuel Surcharge [Member] |  |  |  |  |
Revenue |  | 28,049,000 | 29,286,000 | 80,507,000 | 91,349,000
Operating Segments [Member] |  |  |  |  |
Revenue |  | 296,836,000 | 287,885 | 869,045,000 | 854,145,000
Segment operating expenses |  | 282,200,000 | 259,122,000 | 821,418,000 | 768,731,000
Subtotal operating income |  | 14,689,000 | 28,763,000 | 47,680,000 | 85,414,000
Operating Segments [Member] | Cargo and Freight [Member] |  |  |  |  |
Revenue |  | 268,787,000 | 258,599,000 | 788,538,000 | 762,796,000
Operating Segments [Member] | Fuel Surcharge [Member] |  |  |  |  |
Revenue | [1] | 28,049,000 | 29,286,000 | 80,507,000 | 91,349,000
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] |  |  |  |  |
Revenue |  | 53,000 | 0 | 53,000 | 0
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |  |  |
Interest expense, net |  |  | (3,204,000) |  |
Expedited [Member] |  |  |  |  |
Revenue |  |  |  |  |
Expedited [Member] | Operating Segments [Member] |  |  |  |  |
Revenue |  | 94,632,000 | 104,314 | 286,625,000 | 317,795,000
Salaries, wages, and related expenses |  | 30,756,000 | 33,750,000 | 94,398,000 | 103,673,000
Fuel expense |  | 14,584,000 | 15,469,000 | 43,854,000 | 50,028,000
Operations and maintenance |  | 10,099,000 | 10,182,000 | 31,263,000 | 30,050,000
Revenue equipment rentals and purchased transportation |  | 17,742,000 | 16,571,000 | 51,439,000 | 50,892,000
Operating taxes and licenses |  | 356,000 | 358,000 | 1,033,000 | 1,310,000
Insurance and claims |  | 6,647,000 | 6,638,000 | 19,964,000 | 19,968,000
Communications and utilities |  | 0 | 0 | 1,000 | 1,000
General supplies and expenses |  | 235,000 | 256,000 | 704,000 | 704,000
Depreciation and amortization |  | 1,000 | 4,000 | 4,000 | 19,000
Loss on disposition of property and equipment, net |  | 0 |  | 0 | 0
Total allocated overhead |  | 9,133,000 | 8,814,000 | 25,830,000 | 25,177,000
Segment operating expenses |  | 89,553,000 | 92,042,000 | 268,490,000 | 281,822,000
Subtotal operating income |  | 5,079,000 | 12,272,000 | 18,135,000 | 35,973,000
Expedited [Member] | Operating Segments [Member] | Cargo and Freight [Member] |  |  |  |  |
Revenue |  | 80,184,000 | 87,363,000 | 243,662,000 | 262,881,000
Expedited [Member] | Operating Segments [Member] | Fuel Surcharge [Member] |  |  |  |  |
Revenue | [1] | 14,448,000 | 16,951,000 | 42,963,000 | 54,914,000
Expedited [Member] | Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] |  |  |  |  |
Revenue |  |  |  |  |
Dedicated [Member] |  |  |  |  |
Revenue |  |  |  |  |
Dedicated [Member] | Operating Segments [Member] |  |  |  |  |
Revenue |  | 105,020,000 | 94,715 | 300,906,000 | 272,662,000
Salaries, wages, and related expenses |  | 43,760,000 | 36,873,000 | 125,160,000 | 104,485,000
Fuel expense |  | 14,690,000 | 12,686,000 | 41,328,000 | 37,589,000
Operations and maintenance |  | 12,667,000 | 8,998,000 | 34,581,000 | 27,110,000
Revenue equipment rentals and purchased transportation |  | 8,453,000 | 7,361,000 | 26,027,000 | 22,634,000
Operating taxes and licenses |  | 667,000 | 461,000 | 1,927,000 | 1,002,000
Insurance and claims |  | 5,057,000 | 4,176,000 | 15,221,000 | 11,830,000
Communications and utilities |  | 196,000 | 140,000 | 583,000 | 315,000
General supplies and expenses |  | 482,000 | 486,000 | 1,616,000 | 1,605,000
Depreciation and amortization |  | 4,369,000 | 3,317,000 | 12,658,000 | 8,557,000
Loss on disposition of property and equipment, net |  | (63,000) | (132,000) | 225,000 | (170,000)
Total allocated overhead |  | 10,643,000 | 9,555,000 | 29,308,000 | 26,283,000
Segment operating expenses |  | 100,921,000 | 83,921,000 | 288,634,000 | 241,240,000
Subtotal operating income |  | 4,099,000 | 10,794,000 | 12,272,000 | 31,422,000
Dedicated [Member] | Operating Segments [Member] | Cargo and Freight [Member] |  |  |  |  |
Revenue |  | 91,581,000 | 82,676,000 | 263,827,000 | 237,124,000
Dedicated [Member] | Operating Segments [Member] | Fuel Surcharge [Member] |  |  |  |  |
Revenue | [1] | 13,439,000 | 12,039,000 | 37,079,000 | 35,538,000
Dedicated [Member] | Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] |  |  |  |  |
Revenue |  |  |  |  |
Managed Freight [Member] |  |  |  |  |
Revenue |  |  |  |  |
Managed Freight [Member] | Operating Segments [Member] |  |  |  |  |
Revenue |  | 72,220,000 | 63,385 | 206,620,000 | 186,668,000
Salaries, wages, and related expenses |  | 2,758,000 | 2,756,000 | 7,880,000 | 6,819,000
Fuel expense |  | 0 | 0 | 0 | 0
Operations and maintenance |  | 689,000 | 968,000 | 1,195,000 | 1,149,000
Revenue equipment rentals and purchased transportation |  | 62,545,000 | 53,067,000 | 176,734,000 | 158,638,000
Operating taxes and licenses |  | 18,000 | 11,000 | 84,000 | 34,000
Insurance and claims |  | 205,000 | 428,000 | 361,000 | 676,000
Communications and utilities |  | 7,000 | 5,000 | 25,000 | 16,000
General supplies and expenses |  | 769,000 | 766,000 | 2,444,000 | 2,267,000
Depreciation and amortization |  | 22,000 | 21,000 | 65,000 | 63,000
Loss on disposition of property and equipment, net |  | 0 | 0 | 0 | 0
Total allocated overhead |  | 2,247,000 | 2,417,000 | 6,870,000 | 7,523,000
Segment operating expenses |  | 69,260,000 | 60,439,000 | 195,658,000 | 177,185,000
Subtotal operating income |  | 2,960,000 | 2,946,000 | 10,962,000 | 9,483,000
Managed Freight [Member] | Operating Segments [Member] | Cargo and Freight [Member] |  |  |  |  |
Revenue |  | 72,220,000 | 63,385,000 | 206,620,000 | 186,668,000
Managed Freight [Member] | Operating Segments [Member] | Fuel Surcharge [Member] |  |  |  |  |
Revenue | [1] | 0 | 0 | 0 | 0
Managed Freight [Member] | Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] |  |  |  |  |
Revenue |  |  |  |  |
Warehousing [Member] |  |  |  |  |
Revenue |  |  |  |  |
Warehousing [Member] | Operating Segments [Member] |  |  |  |  |
Revenue |  | 24,964,000 | 25,471 | 74,894,000 | 77,020,000
Salaries, wages, and related expenses |  | 12,044,000 | 11,589,000 | 35,822,000 | 35,270,000
Fuel expense |  | 167,000 | 347,000 | 498,000 | 1,155,000
Operations and maintenance |  | 1,471,000 | 1,374,000 | 4,154,000 | 4,092,000
Revenue equipment rentals and purchased transportation |  | 1,052,000 | 1,241,000 | 3,302,000 | 3,671,000
Operating taxes and licenses |  | 383,000 | 506,000 | 1,732,000 | 1,794,000
Insurance and claims |  | 220,000 | 203,000 | 666,000 | 601,000
Communications and utilities |  | 249,000 | 224,000 | 716,000 | 669,000
General supplies and expenses |  | 4,161,000 | 4,329,000 | 13,308,000 | 12,679,000
Depreciation and amortization |  | 461,000 | 455,000 | 1,419,000 | 1,291,000
Loss on disposition of property and equipment, net |  | 0 | 0 | 0 | 0
Total allocated overhead |  | 2,258,000 | 2,452,000 | 7,019,000 | 7,262,000
Segment operating expenses |  | 22,466,000 | 22,720,000 | 68,636,000 | 68,484,000
Subtotal operating income |  | 2,498,000 | 2,751,000 | 6,258,000 | 8,536,000
Warehousing [Member] | Operating Segments [Member] | Cargo and Freight [Member] |  |  |  |  |
Revenue |  | 24,802,000 | 25,175,000 | 74,429,000 | 76,123,000
Warehousing [Member] | Operating Segments [Member] | Fuel Surcharge [Member] |  |  |  |  |
Revenue | [1] | $ 162,000 | $ 296,000 | $ 465,000 | 897,000
Warehousing [Member] | Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] |  |  |  |  |
Revenue |  |  |  |  |
[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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