Segment Information (Schedule Of Segment Reporting Information By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Apr. 30, 2012
Segment Reporting Information [Line Items]
Revenues	$ 9,638	$ 11,514
Operating Expenses	9,354	10,669
Operating Income (Loss)	284	845
Assets	38,223		41,869
Ediscovery [Member]
Segment Reporting Information [Line Items]
Revenues	4,073	6,026
Operating Expenses	5,107	4,982
Operating Income (Loss)	(1,034)	1,044
Assets	27,926		29,657
Database, Archive And Migration [Member]
Segment Reporting Information [Line Items]
Revenues	5,565	5,488
Operating Expenses	3,553	3,643
Operating Income (Loss)	2,012	1,845
Assets	10,297		12,212
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating Expenses	694	2,044
Operating Income (Loss)	$ (694)	$ (2,044)