Income Taxes (Schedule of Defered Income Tax Assets and Liabilities) (Details) - USD ($)	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Deferred tax assets:
Net operating loss	$ 8,271,894	$ 7,487,076
Allowance for doubtful accounts	26,793	21,416
Intangible assets	249,099	304,062
Deferred rent	11,678	2,872
Stock-based compensation	694,900	580,672
Contributions carryforward	93	93
Total deferred tax assets	9,254,457	8,396,191
Deferred tax liabilities:
Property and equipment	(185,683)	(155,991)
Total deferred tax liabilities	(185,683)	(155,991)
Deferred tax assets, net	9,068,774	8,240,200
Valuation allowance:
Valuation allowance	(9,068,774)	(8,240,200)	$ (6,664,215)
Net deferred tax asset