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Investments (Detail Textuals) - USD ($)
 3 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Apr. 30, 2015
Schedule of Available-for-sale Securities [Line Items]      
Aggregate cost of equity securities available for sale $ 9,607,000   $ 9,470,000
Fair value of equity securities 9,627,000   9,632,000
Decrease in gross unrealized gains on equity securities classified as available-for-sale (142,000) $ (131,000)  
Equity Securities      
Schedule of Available-for-sale Securities [Line Items]      
Aggregate cost of equity securities available for sale 9,607,000   9,470,000
Fair value of equity securities 9,627,000   9,632,000
Decrease in gross unrealized gains on equity securities classified as available-for-sale (142,000) (131,000)  
Deferred taxes on unrealized gains on securities 50,000 $ 46,000  
Accumulated other comprehensive income included unrealized gains, net of tax 20,000   162,000
Deferred taxes on accumulated other comprehensive income $ 7,000   $ 57,000