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Investments - Carrying value and fair value of securities available-for-sale (Details) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2014
Apr. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 8,871 $ 8,847
Gross Unrealized Gains 1,585 1,327
Gross Unrealized Losses (1,233) (948)
Fair Value 9,223 9,226
Common stocks
   
Schedule of Available-for-sale Securities [Line Items]    
Cost 101 101
Gross Unrealized Gains 64 47
Gross Unrealized Losses (6) (12)
Fair Value 159 136
ETFs - equities
   
Schedule of Available-for-sale Securities [Line Items]    
Cost 3,902 3,878
Gross Unrealized Gains 1,521 1,280
Gross Unrealized Losses (2) (2)
Fair Value 5,421 5,156
Inverse ETFs - equities
   
Schedule of Available-for-sale Securities [Line Items]    
Cost 4,868 4,868
Gross Unrealized Gains      
Gross Unrealized Losses (1,225) (934)
Fair Value $ 3,643 $ 3,934