Property, Plant and Equipment (Details) (USD $)	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Equipment Property, Plant And Equipment 1	$ 977,779
Equipment Property, Plant And Equipment 2	949,069
Equipment Property, Plant And Equipment 3	28,710
Equipment Property, Plant And Equipment 4	990,657
Equipment Property, Plant And Equipment 5	946,411
Equipment Property, Plant And Equipment 6	44,246
Equipment Property, Plant And Equipment 7	321,642
Equipment Property, Plant And Equipment 8	252,297
Equipment Property, Plant And Equipment 9	69,345
Equipment Property, Plant And Equipment 10	235,238
Equipment Property, Plant And Equipment 11	223,246
Equipment Property, Plant And Equipment 12	11,992
Equipment Property, Plant And Equipment 13	49,915
Equipment Property, Plant And Equipment 14	49,915
Equipment Property, Plant And Equipment 15	0
Equipment Property, Plant And Equipment 16	2,575,231
Equipment Property, Plant And Equipment 17	2,420,938
Equipment Property, Plant And Equipment 18	154,293
Equipment Property, Plant And Equipment 1		898,188
Equipment Property, Plant And Equipment 2		877,273
Equipment Property, Plant And Equipment 3		20,915
Equipment Property, Plant And Equipment 4		965,780
Equipment Property, Plant And Equipment 5		850,051
Equipment Property, Plant And Equipment 6		115,729
Equipment Property, Plant And Equipment 7		250,192
Equipment Property, Plant And Equipment 8		230,948
Equipment Property, Plant And Equipment 9		19,244
Equipment Property, Plant And Equipment 10		231,511
Equipment Property, Plant And Equipment 11		219,413
Equipment Property, Plant And Equipment 12		12,098
Equipment Property, Plant And Equipment 13		49,915
Equipment Property, Plant And Equipment 14		49,915
Equipment Property, Plant And Equipment 15		0
Equipment Property, Plant And Equipment 16		2,395,586
Equipment Property, Plant And Equipment 17		2,227,600
Equipment Property, Plant And Equipment 18		$ 167,986