Note 13 - Change in Accounting Estimate (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Note 13 - Change in Accounting Estimate (Details) [Line Items]
Other Comprehensive Income (Loss), Effect of Change in Accounting Principle, before Taxes (in Dollars)	$ (0.20)
Other Comprehensive Income (Loss), Effect of Change in Accounting Principle, Net of Taxes (in Dollars)	$ (0.13)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share (in Dollars per share)	$ 0.01
Single Driver Tractor [Member]
Note 13 - Change in Accounting Estimate (Details) [Line Items]
Property, Plant and Equipment, Useful Life	60 months	45 months
Property, Plant and Equipment, Salvage Value, Percentage	30.00%	43.00%
Team Tractor [Member]
Note 13 - Change in Accounting Estimate (Details) [Line Items]
Property, Plant and Equipment, Useful Life	48 months	36 months
Property, Plant and Equipment, Salvage Value, Percentage	40.00%	43.00%