Note 5 - VIEs Put Options On CPS (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Dec. 31, 2011 Consolidated Committed Preferred Custodial Trust Securities	Sep. 30, 2003 Unconsolidated Committed Preferred Custodial Trust Securities
Balance Sheet Related Disclosures
Short-term Investments	$ 705,744,000	$ 1,261,703,000	$ 150,000,000
CPS Additional Disclosure
Number of Committed Preferred Custodial Trusts				3
Committed Preferred Custodial Trust Securities				150,000,000
Committed Preferred Custodial Trust Securities Held By Each Trust				50,000,000
Maximum exposure (1)			$ 150,000,000