Other Long-Term Liabilities (Schedule Of Other Long-Term Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012	Apr. 30, 2012
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	$ 1,165	$ 1,148
Other - Severance For French Employees [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	123	123
Other - Long Term Deferred Support Revenue [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	388	252
Roseville Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	42	83
New York Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	117	128
New York Office [Member] | Unfavorable Lease Terms [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	162	194
San Francisco Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	79	74
New Jersey Office [Member] | Unfavorable Lease Terms [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	$ 254	$ 294