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, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Employee Service Share-based Compensation, Allocation Of Recognized Period Costs [Line Items]
Total equity based compensation	$ 39	$ 38	$ 91	$ 130
Direct Costs of Revenue [Member]
Employee Service Share-based Compensation, Allocation Of Recognized Period Costs [Line Items]
Total equity based compensation	3	3	10	12
Product Development
Employee Service Share-based Compensation, Allocation Of Recognized Period Costs [Line Items]
Total equity based compensation	2	5	6	24
Selling, General and Administrative[Member]
Employee Service Share-based Compensation, Allocation Of Recognized Period Costs [Line Items]
Total equity based compensation	$ 34	$ 30	$ 75	$ 94