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Marketable Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2013
Schedule of length of time that available-for-sale securities were in continuous unrealized loss positions  
Less Than 12 Months, Fair Value $ 6,495
Less Than 12 Months, Unrealized Losses (202)
Greater Than or Equal to 12 Months, Fair Value 1,021
Greater Than or Equal to 12 Months, Unrealized Losses (229)
Total Fair Value 7,516
Total Unrealized Losses (431)
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 6,495
Less Than 12 Months, Unrealized Losses (202)
Greater Than or Equal to 12 Months, Fair Value 1,021
Greater Than or Equal to 12 Months, Unrealized Losses (229)
Total Fair Value 7,516
Total Unrealized Losses $ (431)