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Note B - Restricted Cash and Cash Equivalents and Restricted Investments Available for Sale (Detail) - Summary of Restricted Cash Equivalents and Investments (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Restricted cash and cash equivalents $ 200 $ 13,449
Total restricted cash and cash equivalents and restricted investments available for sale 200 22,602
US Treasury Securities [Member]
   
Restricted Investments Available for Sale 0 5,007
Corporate Notes and Bonds [Member]
   
Restricted Investments Available for Sale 0 4,062
Accrued Interest Income [Member]
   
Restricted Investments Available for Sale 0 84
Total Restricted Investments Available for Sale [Member]
   
Restricted Investments Available for Sale $ 0 $ 9,153