Schedule of Product Warranty Liability (Details) (USD $)	12 Months Ended
	Apr. 30, 2014
Significant Accounting Policies Schedule Of Product Warranty Liability 1	$ 91,151
Significant Accounting Policies Schedule Of Product Warranty Liability 2	84,948
Significant Accounting Policies Schedule Of Product Warranty Liability 3	0
Significant Accounting Policies Schedule Of Product Warranty Liability 4	0
Significant Accounting Policies Schedule Of Product Warranty Liability 5	(21,992)
Significant Accounting Policies Schedule Of Product Warranty Liability 6	6,203
Significant Accounting Policies Schedule Of Product Warranty Liability 7	69,159
Significant Accounting Policies Schedule Of Product Warranty Liability 8	$ 91,151