Note 14 - Contingencies and Guarantees (Detail) (USD $)	3 Months Ended	12 Months Ended	36 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2007	Mar. 31, 2012 Workers Compensation Premium Revenue [Member]	Dec. 31, 2012 Workers Compensation Premium Revenue [Member]	Mar. 31, 2013 Professional Liability Insurance [Member]	Mar. 31, 2012 Professional Liability Insurance [Member]	Mar. 31, 2012 Coverage Amount per Incident [Member]	Mar. 31, 2012 Coverage Amount per Location [Member]
Self Insurance Reserve	$ 114,367,000	$ 110,331,000
Direct Business Coverage Statutory Limits	1,000,000
Other Premium Revenue, Net					1,349,000	3,609,000	962,000	1,051,000
Primary Insurance Coverage Amount Per Incident									1,000,000
Primary Insurance Coverage Amount Per Location										3,000,000
Annual Excess Coverage		$ 4,000,000	$ 9,000,000	$ 7,500,000