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Marketable Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 01, 2012
Schedule of length of time that available-for-sale securities were in continuous unrealized loss positions  
Less Than 12 Months, Fair Value $ 11,987
Less Than 12 Months, Unrealized Losses (8)
Greater Than or Equal to 12 Months, Fair Value 1,057
Greater Than or Equal to 12 Months, Unrealized Losses (193)
Total Fair Value 13,044
Total Unrealized Losses (201)
Municipal bonds [Member]
 
Schedule of length of time that available-for-sale securities were in continuous unrealized loss positions  
Less Than 12 Months, Fair Value 11,987
Less Than 12 Months, Unrealized Losses (8)
Greater Than or Equal to 12 Months, Fair Value 1,057
Greater Than or Equal to 12 Months, Unrealized Losses (193)
Total Fair Value 13,044
Total Unrealized Losses $ (201)