Note 8 - Claims Liabilities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Claims Liabilities [Abstract]
Self-insurance Retention Levels, Workers' Compensation Claims Per Occurrence	$ 0.5
Self-insurance Retention Levels, Cargo Loss and Damage Claims Per Occurrence	0.05
Self-insurance Retention Levels, Bodily Injury and Property Damage Claims Per Occurrence	1.0
Self-insurance Retention Levels, Medical Benefits Per Plan Participant	$ 0.25