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Investments (Detail Textuals) (USD $)	3 Months Ended
	Jul. 31, 2012	Apr. 30, 2012	Jul. 31, 2011
Investments, Debt and Equity Securities [Abstract]
Aggregate cost of equity securities available for sale	$ 4,053,000	$ 3,749,000
Fair value	4,226,000	3,881,000
Other comprehensive income (loss), available-for-sale securities adjustment, before tax, portion attributable to parent	42,000		(75,000)
Other comprehensive income unrealized holding gain loss on securities arising during period tax (expense) Benefit	15,000		26,000
Accumulated other comprehensive income, net of tax	112,000	85,000
Deferred taxes on unrealized gains on securities	61,000	47,000
Proceeds from maturities and sales of government debt securities			2,998,000
Realized losses on sales of fixed income securities			$ 5,000

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Before tax amount of the appreciation (loss) in value of unsold available-for-sale securities attributable to the parent entity. Excludes amounts related to other than temporary impairment (OTTI) losses.

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