Summary of Significant Accounting Policies (Details Textual) (USD $)	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Estimated Fair Value Of Warrants	$ 2,011,000	$ 1,046,000
Allowance for Doubtful Accounts Receivable	2,000	19,000
Unbilled Receivables, Current	884,000	200,000
Restricted Cash and Cash Equivalents, Noncurrent	165,000	192,000
Depreciation, Total	213,000	203,000
Deferred Revenue	$ 258,000