Income Taxes Schedule of the Components of Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Deferred Income Tax Expense (Benefit)			$ 254,000	$ 0
Income Tax Expense (Benefit)	$ 198,000	$ 0	$ 254,000	$ 0