Investments - Equity Method Investment (Detail Textuals 1) - USD ($)		12 Months Ended
		Apr. 30, 2015	Apr. 30, 2014
Schedule of Equity Method Investments [Line Items]
Investment in EAM Trust		$ 58,048,000	$ 57,850,000
EAM Trust
Schedule of Equity Method Investments [Line Items]
Investment in EAM Trust	[1]	58,048,000	57,850,000
Fair value of contributed capital at inception		55,805,000	55,805,000
Cash and liquid securities in excess of working capital requirements contributed to capital account		$ 5,820,000	$ 5,820,000
Non-voting profits interest ("Profits Interest")		50.00%	50.00%
Payable to VLI for its accrued non-voting revenues and non-voting profits interests		$ 1,951,000	$ 1,887,000

[1] Reported within Long Term Assets on Consolidated Balance Sheets.