Financial Information by Geographic Location (Details) (USD $)	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographic location	$ 7,725,037	$ 7,366,730
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographic location	6,630,728	6,182,801
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographic location	938,767	870,627
Other (principally Asia Pacific Region)
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographic location	$ 155,542	$ 313,302