Stock Compensation Information (Summary Of Equity-Based compensation Expense From Operations) (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
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total equity based compensation	$ 161	$ 230	$ 492	$ 704
Direct Costs of Revenue [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total equity based compensation	9	17	27	55
Product Development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total equity based compensation	21	37	70	116
Selling, General and Administrative[Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total equity based compensation	$ 131	$ 176	$ 395	$ 533