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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
OPERATING ACTIVITIES:      
Net income $ 17,827,000 $ 7,900,000 $ 23,994,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 56,168,000 55,107,000 49,387,000
Bad debt expense 530,000 728,000 889,000
Stock compensation—net of excess tax benefits 460,000 912,000 732,000
Provision for deferred income taxes 5,362,000 1,625,000 7,206,000
Recognized loss (gain) on marketable equity securities 3,463,000 (4,753,000) 5,388,000
Loss (gain) on sale or disposal of equipment 373,000 583,000 (1,306,000)
Changes in operating assets and liabilities:      
Accounts receivable (17,835,000) 884,000 (5,970,000)
Prepaid expenses, deposits, inventories, and other assets (1,780,000) 1,865,000 (137,000)
Income taxes refundable (60,000) 1,372,000 (76,000)
Trade accounts payable 20,880,000 (2,233,000) 1,731,000
Accrued expenses and other liabilities (17,798,000) 20,307,000 509,000
Net cash provided by operating activities 67,590,000 84,297,000 82,347,000
INVESTING ACTIVITIES:      
Purchases of property and equipment (48,226,000) (79,354,000) (73,882,000)
Proceeds from disposition of equipment 17,418,000 14,263,000 24,904,000
Sales of marketable equity securities 2,039,000 2,984,000 1,045,000
Purchases of marketable equity securities, net of return of capital (3,923,000) (203,000) (7,318,000)
Net cash used in investing activities (32,692,000) (62,310,000) (55,251,000)
FINANCING ACTIVITIES:      
Borrowings under line of credit 517,668,000 590,902,000 615,612,000
Repayments under line of credit (516,468,000) (584,047,000) (605,419,000)
Borrowings of long-term debt 26,837,000 60,203,000 52,717,000
Repayments of long-term debt (64,411,000) (70,917,000) (82,442,000)
Borrowings under margin account 7,068,000 527,000 7,584,000
Repayments under margin account (3,292,000) (4,334,000) (2,206,000)
Repurchases of treasury stock (2,281,000) (14,285,000) (13,369,000)
Proceeds from exercise of stock options 0 0 485,000
Net cash used in financing activities (34,879,000) (21,951,000) (27,038,000)
NET INCREASE IN CASH AND CASH EQUIVALENTS 19,000 36,000 58,000
CASH AND CASH EQUIVALENTS—Beginning of year 318,000 282,000 224,000
CASH AND CASH EQUIVALENTS—End of year 337,000 318,000 282,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION—      
Interest 8,798,000 8,612,000 6,095,000
Income taxes 281,000 671,000 217,000
NONCASH INVESTING AND FINANCING ACTIVITIES—      
Purchases of revenue equipment included in accounts payable $ 9,050,000 $ 366,000 $ 1,597,000