Segment Information (Schedule Of Segment Reporting Information By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Apr. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 6,662	$ 7,964
Operating Expenses	6,604	7,988
Operating Income (Loss)	58	(24)
Assets	29,439		33,653
Archive And eDiscovery [Member]
Segment Reporting Information [Line Items]
Revenues	4,104	5,415
Operating Expenses	3,259	4,658
Operating Income (Loss)	845	757
Assets	25,057		28,242
Development, Database, and Migration Tools [Member]
Segment Reporting Information [Line Items]
Revenues	2,558	2,549
Operating Expenses	1,673	1,524
Operating Income (Loss)	885	1,025
Assets	4,382		5,411
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating Expenses	1,672	1,806
Operating Income (Loss)	$ (1,672)	$ (1,806)