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Condensed Consolidated Statements of Operations (unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
OPERATING REVENUES:    
Revenue, before fuel surcharge $ 75,168 $ 68,123
Fuel surcharge 20,987 16,903
Total operating revenues 96,155 85,026
OPERATING EXPENSES AND COSTS:    
Salaries, wages and benefits 32,041 28,829
Fuel expense 30,847 31,264
Rents and purchased transportation 6,998 4,884
Depreciation 9,247 8,032
Operating supplies and expenses 9,325 9,155
Operating taxes and licenses 1,240 1,266
Insurance and claims 3,335 3,279
Communications and utilities 590 721
Other 1,410 1,384
Loss on disposition of equipment 36 25
Total operating expenses and costs 95,069 88,839
OPERATING INCOME (LOSS) 1,086 (3,813)
NON-OPERATING INCOME 594 1,126
INTEREST EXPENSE (561) (490)
INCOME (LOSS) BEFORE INCOME TAXES 1,119 (3,177)
FEDERAL AND STATE INCOME TAX EXPENSE (BENEFIT):    
Current 34 0
Deferred 411 (1,199)
Total federal and state income tax expense (benefit) 445 (1,199)
NET INCOME (LOSS) $ 674 $ (1,978)
INCOME (LOSS) PER COMMON SHARE:    
Basic (in dollars per share) $ 0.08 $ (0.21)
Diluted (in dollars per share) $ 0.08 $ (0.21)
AVERAGE COMMON SHARES OUTSTANDING:    
Basic (in shares) 8,696 9,392
Diluted (in shares) 8,698 9,392
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) $ 1.00 $ 0