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Revenue by geographic location (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Jan. 31, 2014
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Jan. 31, 2013
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Jan. 31, 2014
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Jan. 31, 2013
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| Revenues by geographic location | $ 7,641,079 | $ 6,438,961 | $ 22,418,038 | $ 21,396,469 |
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United States
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| Revenues by geographic location | 6,246,904 | 4,572,914 | 18,562,000 | 16,553,265 |
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Europe
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| Revenues by geographic location | 830,553 | 1,217,323 | 2,359,604 | 3,167,483 |
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Other (principally Asia Pacific Region)
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| Revenues by geographic location | $ 563,622 | $ 648,724 | $ 1,496,434 | $ 1,675,721 |
| X | ||||||||||
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- Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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