SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Balance, beginning of period	$ 1,153,321	$ 1,113,147	$ 1,117,322	$ 1,038,428
Distributions to noncontrolling interest	(166,846)	0	(166,846)	0
Net income attributable to noncontrolling interest	54,317	36,500	82,922	96,560
Other comprehensive income attributable to noncontrolling interest	3,004	6,357	10,398	21,016
Balance, end of period	$ 1,043,796	$ 1,156,004	$ 1,043,796	$ 1,156,004