GAIN FROM SETTLEMENT: (Details Textual) - USD ($)	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Gain Loss From Settlement [Line Items]
Reduction of Accounts Receivable Due To Settlement	$ 22,626,000
Reduction of Accounts Payable Due To Settlement	$ 38,214,000
Discontinued Operations [Member]
Gain Loss From Settlement [Line Items]
Disposal Group, Including Discontinued Operation, Other Income		$ 11,155,000
Common Stock [Member]
Gain Loss From Settlement [Line Items]
Stock Issued During Period, Shares, New Issues	825,000	825,000
Stock Issued During Period, Value, New Issues	$ 4,274,000
Stock Issued During Period, Percentage	10.30%