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Note 1 - Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Bank Overdrafts	$ 4,377,000	$ 3,509,000
Due from Employees, Current	448,000	628,000
Increase in Depreciation Expense, As Result of Adjustments to Estimated Useful Lives and Salvage Values	$ 2,700,000	1,300,000
Period for Amortizing Prepaid Tires	2 years
Advertising Expense	$ 1,087,000	$ 1,019,000	$ 988,000
Truckload Services [Member] | Sales Revenue, Services, Net [Member] | Product Concentration Risk [Member]
Concentration Risk, Percentage	86.30%	88.40%	87.60%

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- Definition

The increase in depreciation expense as a result of adjustments to the estimated useful lives and salvage values during the period.

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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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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amounts due from an Entity employee, not to include stockholders or officers, which are usually due within 1 year (or 1 business cycle).

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