Investments (Detail Textuals) (USD $)	3 Months Ended
Jul. 31, 2013	Jul. 31, 2012	Apr. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Aggregate cost of equity securities available for sale	$ 7,518,000		$ 6,295,000
Fair value of equity securities	7,903,000		6,682,000
Increase (decreases) in gross unrealized gains on equity securities classified as available-for-sale	(4,000)	42,000
Accumulated other comprehensive income, net of tax	248,000		251,000
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Aggregate cost of equity securities available for sale	7,518,000		6,295,000
Fair value of equity securities	7,903,000		6,682,000
Increase (decreases) in gross unrealized gains on equity securities classified as available-for-sale	(4,000)	42,000
Deferred taxes on unrealized gains on securities	1,000	15,000
Accumulated other comprehensive income, net of tax	385,000		387,000
Deferred taxes on accumulated other comprehensive income	$ 137,000		$ 136,000

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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