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Investments (Detail Textuals) (USD $) | 12 Months Ended
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Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Aggregate cost of equity securities available for sale | $ 6,295,000 |  | $ 3,749,000 |  |  |
Fair value of equity securities | 6,682,000 |  | 3,881,000 |  |  |
Other comprehensive income (loss), available-for-sale securities adjustment, before tax, portion attributable to parent | 255,000 |  | 35,000 |  | 100,000 |
Proceeds from maturities and sales of government debt securities |  |  | 11,196,000 |  | 38,021,000 |
Realized loss on sales of fixed income securities |  | [1] | (11,000) | [1] | (63,000) | [1]
Accumulated other comprehensive income, net of tax | 251,000 |  | 85,000 |  |  |
Equity Securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Aggregate cost of equity securities available for sale | 6,295,000 |  | 3,749,000 |  |  |
Fair value of equity securities | 6,682,000 |  | 3,881,000 |  |  |
Increase in gross unrealized gains on equity securities | 255,000 |  | 24,000 |  | 106,000 |
Deferred taxes on unrealized gains on securities | 89,000 |  | 9,000 |  | 37,000 |
Proceeds from maturities and sales of government debt securities |  |  | 89,000 |  |  |
Realized loss on sales of fixed income securities | 11,000 |  |  |  |  |
Government Debt Securities (Fixed Income Securities) |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Deferred taxes on unrealized gains on securities | 136,000 |  | 46,000 |  |  |
Proceeds from maturities and sales of government debt securities |  |  | 11,196,000 |  | 38,021,000 |
Realized loss on sales of fixed income securities |  |  | 22,000 |  | 68,000 |
Accumulated other comprehensive income, net of tax | 387,000 |  | 131,000 |  |  |
Interest income recorded net of bond premium amortization |  |  |  |  | $ 14,000 |
[1] | These amounts were reclassified from Accumulated Other Comprehensive Income in the Consolidated Balance Sheets to the Consolidated Statements of Income.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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