Intangible Assets and Goodwill (Details Narrative) (USD $)	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Intangible Assets and Goodwill (Textual) [Abstract]
Intangible assets, Amortization method	Straight-line basis
Impairments of intangible assets		$ 2,387,241		$ 2,387,241
Residual value of intangible assets	0		0
Intangible assets amortization expense	$ 41,000	$ 41,000	$ 123,000	$ 123,000
Maximum
Intangible Assets and Goodwill (Textual) [Abstract]
Intangible Asset, Estimated period of benefit	5 years
Minimum
Intangible Assets and Goodwill (Textual) [Abstract]
Intangible Asset, Estimated period of benefit	4 years
Research and Development and Customer Relationships
Intangible Assets and Goodwill (Textual) [Abstract]
Intangible assets, Amortization method	Amortized over a two-year period at a rate of 65% of the gross value acquired in the first year subsequent to their acquisition and 35% of the gross value acquired in the second year.