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Significant Accounting Policies (Details Textual) (USD $)
3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Aug. 31, 2012
Letters Of Credit Pledged As Collateral Towards Workers Compensation $ 2,713,000   $ 2,855,000
Pledged Financial Instruments, Not Separately Reported, Securities for Letter of Credit Facilities 549,000   548,000
Restricted Cash and Cash Equivalents 831,000   0
Allowance for Doubtful Accounts Receivable 217,000   273,000
Inventory Valuation Reserves $ 910,000   $ 972,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 40,000 40,000  
Convertible Preferred Stock, Shares Issued upon Conversion 36,000 36,000  
Foreign Currency Exchange Rate, Translation 1.01 1.02  
Entity Wide Information On Geographic Areas Trade Accounts Receivable From External Customers Percentage Attributed To Foreign Countries 8.00% 4.00%  
Entity Wide Information On Geographic Areas Revenue From External Customers Percentage Attributed To Foreign Countries 5.00%   7.00%
Percentage Of Revenue Per Entity Maximum 10.00% 10.00%