Segment Information (Schedule Of Segment Reporting Information By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Apr. 30, 2012
Segment Reporting Information [Line Items]
Revenues	$ 10,345	$ 11,075	$ 19,983	$ 22,589
Operating Expenses	9,443	9,877	18,797	20,546
Operating Income (Loss)	902	1,198	1,186	2,043
Assets	37,395		37,395		41,869
Ediscovery [Member]
Segment Reporting Information [Line Items]
Revenues	4,043	5,529	8,116	11,555
Operating Expenses	4,326	4,933	9,433	9,915
Operating Income (Loss)	(283)	596	(1,317)	1,640
Assets	27,093		27,093		29,657
Database, Archive And Migration [Member]
Segment Reporting Information [Line Items]
Revenues	6,302	5,546	11,867	11,034
Operating Expenses	3,577	3,597	7,130	7,240
Operating Income (Loss)	2,725	1,949	4,737	3,794
Assets	10,302		10,302		12,212
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating Expenses	1,540	1,347	2,234	3,391
Operating Income (Loss)	$ (1,540)	$ (1,347)	$ (2,234)	$ (3,391)