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Investments - Composition of income from securities transactions (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Investments, Debt and Equity Securities [Abstract]        
Dividend income $ 39 $ 36 $ 77 $ 72
Interest income       3   
Other 27 (2) 27   
Total income from securities transactions, net $ 66 $ 34 $ 107 $ 72