Note 1 - Nature of Operations and Basis of Presentation (Detail) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Jun. 30, 2012
Number of Businesses Acquired		9	14	11	3
Number of Service Centers						45
Number of States in which Entity Operates						50
Stock Issued During Period, Shares, New Issues (in Shares)	9.3