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Note 1 - Accounting Policies (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
	Feb. 29, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Truckload Services [Member] | Sales Revenue, Services, Net [Member] | Product Concentration Risk [Member]
Concentration Risk, Percentage		87.60%	92.50%	92.60%
Subsequent Event [Member] | The 2016 Tender Offer [Member] | Minimum [Member]
Treasury Stock Acquired Cost Per Share	$ 27
Subsequent Event [Member] | The 2016 Tender Offer [Member] | Maximum [Member]
Treasury Stock Acquired Cost Per Share	$ 30
Subsequent Event [Member] | The 2016 Tender Offer [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	325,000
Stock Repurchase Program Additional Shares Authroized To Be Repurchased Percent Of Outstanding Shares Percent	2.00%
Stock Repurchase Program Additional Shares Authorized To Be Repurchased Percent Of Outstanding Shares, Shares	142,413
Bank Overdrafts		$ 467,000	$ 0
Due from Employees, Current		$ 580,000	486,000
Decrease in Depreciation Expense as Result of Adjustments to Estimated Lives and Salvage Values				$ 550,000
Increase (Decrease) in Net Income (Loss) as Result of Adjustments to Estimated Lives and Salvage Values				340,000
Increase (Decrease) in Net Income (Loss) Per Share as Result of Adjustments to Estimated Lives and Salvage Values				0.04
Period for Amortizing Prepaid Tires		2 years
Advertising Expense		$ 988,000	$ 683,000	$ 662,000

X

- Definition

Decrease in depreciation expense as a result of adjustments to estimated lives and salvage values.

+ References

No definition available.

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- Definition

Increase Decrease In Net Income Loss As Result Of Adjustments To Estimated Lives And Salvage Values.

+ References

No definition available.

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Increase (decrease) in net income (loss) per common share as a result of adjustments to estimated lives and salvage values.

+ References

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The number of months that prepaid tires are amortized over.

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- Definition

The amount additional shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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The percent of outstanding stock, authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

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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