Income Taxes (Schedule of Defered Income Tax Assets and Liabilities) (Details) - USD ($)	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Deferred tax assets:
Net operating loss	$ 7,487,076	$ 6,021,134
Allowance for doubtful accounts	21,416	55,679
Intangible assets	304,062	294,284
Deferred rent	2,872	7,948
Stock-based compensation	580,672	411,374
Contributions carryforward	93	93
Total deferred tax assets	8,396,191	6,790,512
Deferred tax liabilities:
Property and equipment	(155,991)	(126,297)
Total deferred tax liabilities	(155,991)	(126,297)
Deferred tax assets, net	8,240,200	6,664,215
Valuation allowance:
Valuation allowance	$ (8,240,200)	$ (6,664,215)	$ (4,684,841)
Net deferred tax asset