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Investments (Detail Textuals) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Aggregate cost of equity securities available for sale |  | $ 9,470,000 | $ 8,847,000 |
Fair value of equity securities |  | 9,632,000 | 9,226,000 |
Capital gain distribution from ETFs | [1] | 57,000 | 36,000 |
Increase (decrease) in gross unrealized gains on equity securities classified as available-for-sale |  | (217,000) | (8,000) | $ 256,000
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  | 105,000 | 246,000 |
Equity Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Aggregate cost of equity securities available for sale |  | 9,470,000 | 8,847,000 |
Fair value of equity securities |  | 9,632,000 | 9,226,000 |
Increase (decrease) in gross unrealized gains on equity securities classified as available-for-sale |  | (217,000) | (8,000) |
Deferred taxes on unrealized gains on securities |  | $ 76,000 | $ 3,000 |
Proceeds from maturities and sales of government debt securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  | $ 162,000 | $ 380,000 |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Deferred Tax Expense (Benefit) |  | $ 57,000 | $ 134,000 |
[1] | Capital gain distributions of $57,000 and $36,000 which were reclassified from Accumulated Other Comprehensive Income in the Consolidated Balance Sheets to the Consolidated Statements of Income in fiscal 2015 and 2014, respectively.

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