Segment Information (Schedule Of Segment Reporting Information By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012	Apr. 30, 2012
Segment Reporting Information [Line Items]
Revenues	$ 10,440	$ 11,069	$ 30,423	$ 33,658
Operating Expenses	10,073	10,465	28,870	31,011
Operating Income (Loss)	367	604	1,553	2,647
Assets	37,462		37,462		41,869
Ediscovery [Member]
Segment Reporting Information [Line Items]
Revenues	4,090	4,159	12,206	15,714
Operating Expenses	3,669	5,166	13,102	15,081
Operating Income (Loss)	421	(1,007)	(896)	633
Assets	27,233		27,233		29,657
Database, Archive And Migration [Member]
Segment Reporting Information [Line Items]
Revenues	6,350	6,910	18,217	17,944
Operating Expenses	4,124	3,605	11,254	10,837
Operating Income (Loss)	2,226	3,305	6,963	7,107
Assets	10,229		10,229		12,212
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating Expenses	2,280	1,694	4,514	5,093
Operating Income (Loss)	$ (2,280)	$ (1,694)	$ (4,514)	$ (5,093)