IMPAIRMENT OF ASSETS: (Details Textual) - Operating Activities [Domain] - USD ($)	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Indefinite-lived Intangible Assets [Line Items]
Impairment of assets	$ 2,580,000	$ 686,000
Original Value Of Impaired Real Estate	5,296,000	2,758,000
Fair Value Of Impaired Real Estate	3,515,000	2,082,000
Fulfillment Services [Member]
Indefinite-lived Intangible Assets [Line Items]
Impairment of assets	771,000	0
Real Estate [Member]
Indefinite-lived Intangible Assets [Line Items]
Impairment of Real Estate	$ 1,809,000	$ 686,000