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Taxes (Details Textual) (USD $)
6 Months Ended
Oct. 31, 2012
Apr. 30, 2012
Recognized Tax Benefits $ 66,000 $ 66,000
Payments for Other Taxes 597,000  
Accrued Interest Related To Tax Payment 33,000  
Deferred Tax Liabilities, Net 589,000  
Deferred Income Tax Expense (Benefit) $ 41,000