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 |