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Deferred tax assets (liabilities) (Parenthetical) (Detail) (USD $)
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Decrease in the amount of valuation allowance $ (403,000) $ 49,000
Long Term
   
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Tax effect of net operating loss carry-forward, charitable carry-forward $ 13,000 $ 13,000