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Property And Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Property and equipment, net      
Machinery, equipment and vehicles $ 12,517 $ 12,331  
Buildings and improvements 3,574 3,559  
Computer and office equipment 3,270 3,169  
Software 5,530 4,245  
Furniture and fixtures 1,229 1,154  
Land 287 293  
Subtotal 26,407 24,751  
Less: accumulated depreciation and amortization (17,344) (16,269)  
Total $ 9,063 $ 8,482 $ 9,322