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Investments - Composition of income from securities transactions (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Investments, Debt and Equity Securities [Abstract]        
Dividend income $ 36 $ 34 $ 109 $ 91
Interest income 1 3 2 4
Capital gain 36    36   
Other (3)    (5) (2)
Total income from securities transactions, net $ 70 $ 37 $ 142 $ 93