Other Long-Term Liabilities (Schedule Of Other Long-Term Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Apr. 30, 2012
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	$ 1,079	$ 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	246	252
Roseville Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	62	83
New York Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	120	128
New York Office [Member] | Unfavorable Lease Terms [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	178	194
San Francisco Office [Member] | Deferred Rent [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	76	74
New Jersey Office [Member] | Unfavorable Lease Terms [Member]
Other Long-Term Liabilities [Line Items]
Other Liabilities, Noncurrent	$ 274	$ 294