Note 1 - Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 1 - Accounting Policies (Details) [Line Items]
Bank Overdrafts	$ 0	$ 3,179,000
Due from Employees, Current	486,000	707,000
Decrease in Depreciation Expense as Result of Adjustments to Estimated Lives and Salvage Values		550,000	450,000
Increase Decrease in Net Income Loss as Result of Adjustments to Estimated Lives and Salvage Values		340,000	300,000
Increase Decrease in Net Income Loss Per Share as Result of Adjustments to Estimated Lives and Salvage Values		0.04	0.03
Period for Amortizing Prepaid Tires			24 months
Advertising Expense	$ 683,000	$ 662,000	$ 685,000
Truckload Services [Member] | Sales Revenue, Services, Net [Member] | Product Concentration Risk [Member]
Note 1 - Accounting Policies (Details) [Line Items]
Concentration Risk, Percentage	92.50%	92.60%	91.80%