Segment Information (Schedule Of Segment Reporting Information By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Apr. 30, 2013
Segment Reporting Information [Line Items]
Revenues	$ 7,964	$ 9,638
Operating Expenses	7,988	9,354
Operating Income (Loss)	(24)	284
Assets	34,637		39,707
Ediscovery [Member]
Segment Reporting Information [Line Items]
Revenues	3,328	4,073
Operating Expenses	3,277	5,107
Operating Income (Loss)	51	(1,034)
Assets	27,073		27,700
Database, Archive And Migration [Member]
Segment Reporting Information [Line Items]
Revenues	4,636	5,565
Operating Expenses	2,905	3,553
Operating Income (Loss)	1,731	2,012
Assets	7,564		12,007
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating Expenses	1,806	694
Operating Income (Loss)	$ (1,806)	$ (694)