Stock Compensation Information (Summary Of Equity-Based compensation Expense From Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total equity based compensation	$ 176	$ 228
Direct Costs of Revenue [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total equity based compensation	10	18
Product Development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total equity based compensation	25	39
Selling, General and Administrative[Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total equity based compensation	$ 141	$ 171