Segment Information (Schedule Of Segment Reporting Information By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013	Apr. 30, 2013
Segment Reporting Information [Line Items]
Revenues	$ 7,888	$ 10,440	$ 23,588	$ 30,423
Operating Expenses	8,166	10,073	23,924	28,870
Operating Income (Loss)	(278)	367	(336)	1,553
Assets	33,043		33,043		39,707
Archive And eDiscovery [Member]
Segment Reporting Information [Line Items]
Revenues	4,779	6,902	14,936	19,528
Operating Expenses	4,438	5,612	13,423	18,075
Operating Income (Loss)	341	1,290	1,513	1,453
Assets	29,181		29,181		33,108
Database And Migration [Member]
Segment Reporting Information [Line Items]
Revenues	3,109	3,538	8,652	10,895
Operating Expenses	1,619	2,221	4,842	6,197
Operating Income (Loss)	1,490	1,317	3,810	4,698
Assets	3,862		3,862		6,599
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating Expenses	2,109	2,240	5,659	4,598
Operating Income (Loss)	$ (2,109)	$ (2,240)	$ (5,659)	$ (4,598)