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ACCOUNTING POLICIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
ACCOUNTING POLICIES [Abstract]
Bank overdrafts	$ 4,803,000	$ 6,997,000
Accounts receivable from company drivers	882,000	601,000
Property and Equipment [Line Items]
Decrease in depreciation expense as a result of adjustments to estimated lives and salvage values	450,000
Additional depreciation expense		4,200,000
Increase (decrease) in net income (loss) as a result of adjustments to estimated lives and salvage values	300,000	(2,600,000)
Increase (decrease) in net income (loss) per share as a result of adjustments to estimated lives and salvage values (in dollars per share)	$ 0.03	$ (0.29)
Prepaid Tires [Abstract]
Period for the amortization of prepaid tires	24 months
Advertising Expense [Abstract]
Advertising Expense	$ 685,000	$ 437,000	$ 239,000
Segment Reporting [Abstract]
Truckload transportation services revenues, excluding fuel surcharges as a percentage of total revenues (in hundredths)	91.80%	93.50%	85.90%
Service Vehicles [Member] | Minimum [Member]
Property and Equipment [Line Items]
Useful Life	3 years
Service Vehicles [Member] | Maximum [Member]
Property and Equipment [Line Items]
Useful Life	5 years
Office Furniture and Equipment [Member] | Minimum [Member]
Property and Equipment [Line Items]
Useful Life	3 years
Office Furniture and Equipment [Member] | Maximum [Member]
Property and Equipment [Line Items]
Useful Life	7 years
Revenue Equipment [Member] | Minimum [Member]
Property and Equipment [Line Items]
Useful Life	3 years
Revenue Equipment [Member] | Maximum [Member]
Property and Equipment [Line Items]
Useful Life	12 years
Structures and Improvements [Member] | Minimum [Member]
Property and Equipment [Line Items]
Useful Life	5 years
Structures and Improvements [Member] | Maximum [Member]
Property and Equipment [Line Items]
Useful Life	40 years

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing.

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