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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows provided by operating activities:    
Net income $ 8,214,000 $ 8,193,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 21,383,000 20,047,000
Deferred income taxes 3,416,000 3,680,000
Tax deficiencies from share-based payment arrangement exercises (169,000)
Share-based payment arrangement compensation expense 149,000 290,000
Distribution from affiliate 400,000
Equity in loss from affiliate 143,000 129,000
Changes in other current operating items:    
Receivables 771,000 13,251,000
Prepaid expenses and other 2,205,000 1,305,000
Accounts payable and accrued liabilities 954,000 8,903,000
Insurance and claims accruals 1,142,000 870,000
Net cash provided by operating activities 37,674,000 55,065,000
Cash flows used for investing activities:    
Other (16,000) (16,000)
Net cash used for investing activities (20,962,000) (9,553,000)
Cash flows used for financing activities:    
Borrowings under credit facility and long-term debt 30,816,000 36,225,000
Repayment of borrowings under credit facility and long-term debt (38,702,000) (74,092,000)
Repurchase and retirement of common stock (7,513,000)
Dividends on common stock (817,000) (811,000)
Issuance of common stock from share-based payment arrangement exercises 615,000 1,528,000
Employee taxes paid in exchange for shares withheld (47,000) (127,000)
Net cash used for financing activities (8,135,000) (44,790,000)
Net change in cash and cash equivalents 8,577,000 722,000
Cash and cash equivalents:    
Beginning of period 488,000 434,000
End of period 9,065,000 1,156,000
Supplemental non-cash disclosure:    
Change in property and equipment not yet paid 1,139,000 114,000
Income taxes 290,000 (6,934,000)
Interest 24,000 87,000
Revenue Equipment [Member]    
Adjustments to reconcile net income to net cash provided by operating activities:    
Gain on disposition of assets (1,103,000) (1,434,000)
Cash flows used for investing activities:    
Revenue equipment additions (32,797,000) (18,865,000)
Proceeds from revenue equipment dispositions 12,594,000 10,526,000
Buildings And Land Office Equipment And Other [Member]    
Cash flows used for investing activities:    
Revenue equipment additions $ (743,000) $ (1,198,000)