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Investments (Detail Textuals) (USD $) | 12 Months Ended
--- | ---
Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Schedule of Available-for-sale Securities [Line Items] |  |  |
Aggregate cost of equity securities available for sale | $ 8,847,000 | $ 6,295,000 |
Fair value of equity securities | 9,226,000 | 6,682,000 |
Realized loss on sales of fixed income securities |  |  | (11,000)
Increase (decrease) in gross unrealized gains on equity securities classified as available-for-sale | (8,000) | 256,000 | 35,000
Proceeds from maturities and sales of government debt securities |  |  | 11,196,000
Accumulated other comprehensive income, net of tax | 246,000 | 251,000 |
Equity Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Aggregate cost of equity securities available for sale | 8,847,000 | 6,295,000 |
Fair value of equity securities | 9,226,000 | 6,682,000 |
Realized loss on sales of fixed income securities | 36,000 |  | 11,000
Increase (decrease) in gross unrealized gains on equity securities classified as available-for-sale | (8,000) | 256,000 | 24,000
Deferred taxes on unrealized gains on securities | 3,000 | 90,000 | 9,000
Proceeds from maturities and sales of government debt securities |  |  | 89,000
Government Debt Securities (Fixed Income Securities) |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Realized loss on sales of fixed income securities |  |  | 22,000
Deferred taxes on unrealized gains on securities | 134,000 | 136,000 |
Proceeds from maturities and sales of government debt securities |  |  | 11,196,000
Accumulated other comprehensive income, net of tax | $ 380,000 | $ 387,000 |

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