Income Taxes (Components Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013
Income Taxes [Abstract]
Net operating loss carryforwards	$ 12,207	$ 11,659
Capital loss carryforward		8
Foreign tax credits	353	386
Property, equipment and intangible assets	5,135	5,038
Reserves and other accruals	844	629
Deferred revenue	320	85
Allowance for doubtful accounts	86	107
Reserves and other accruals	448	466
Total deferred tax assets	19,393	18,378
Valuation allowance	(19,393)	(18,345)
Net deferred tax assets		33
Property, equipment and intangible assets		(33)
Goodwill	(1,032)	(890)
Total deferred tax liabilities	(1,032)	(923)
Net deferred tax liabilities	$ (1,032)	$ (890)