Intangible Assets and Goodwill (Details Narrative) (USD $)	3 Months Ended		6 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Intangible Assets and Goodwill (Textual) [Abstract]
Intangible assets, Amortization method	Straight-line basis
Impairments of intangible assets	$ 0
Residual value of intangible assets	0		0
Intangible assets amortization expense	$ 41,000	$ 41,000	$ 82,000	$ 82,000
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.