Financial Information by Geographic Location (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Oct. 31, 2015 |
Oct. 31, 2014 |
Oct. 31, 2015 |
Oct. 31, 2014 |
|
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||||
| Revenues by geographic location | $ 6,050,772 | $ 6,879,716 | $ 13,388,454 | $ 14,604,753 |
| United States | ||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||||
| Revenues by geographic location | 5,108,000 | 5,699,000 | 11,220,000 | 12,330,000 |
| Europe | ||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||||
| Revenues by geographic location | 879,000 | 1,059,000 | 1,995,000 | 1,998,000 |
| Other (principally Asia Pacific Region) | ||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||||
| Revenues by geographic location | $ 64,000 | $ 122,000 | $ 173,000 | $ 277,000 |