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Marketable Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2013
Schedule of length of time that available-for-sale securities were in continuous unrealized loss positions  
Less Than 12 Months, Fair Value $ 13,232
Less Than 12 Months, Unrealized Losses (349)
Greater Than or Equal to 12 Months, Fair Value 1,015
Greater Than or Equal to 12 Months, Unrealized Losses (235)
Total Fair Value 14,247
Total Unrealized Losses (584)
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 13,232
Less Than 12 Months, Unrealized Losses (349)
Greater Than or Equal to 12 Months, Fair Value 1,015
Greater Than or Equal to 12 Months, Unrealized Losses (235)
Total Fair Value 14,247
Total Unrealized Losses $ (584)