FAIR VALUE MEASUREMENTS (Details) - Recurring [Member] - USD ($) $ in Thousands	Apr. 30, 2016	Apr. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Promissory notes	$ 3,988	$ 1,510
Long-term debt	7,682	9,282
Liabilities, fair value disclosure	11,670	10,792
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Promissory notes	0	0
Long-term debt	0	0
Liabilities, fair value disclosure	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Promissory notes	0	0
Long-term debt	0	0
Liabilities, fair value disclosure	0	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Promissory notes	3,988	1,510
Long-term debt	7,682	9,282
Liabilities, fair value disclosure	$ 11,670	$ 10,792