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Investments - Composition of income from securities transactions (Details 1) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Dividend income $ 43 $ 39
Interest income   3
Other 8 (1)
Total income from securities transactions, net $ 51 $ 41