Company And Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Apr. 30, 2013

Stock Compensation Information [Abstract]

Schedule Detailling Activity For The Allowance For Doubtful Accounts And Long-Term Accounts Receivable

						Charges
		Balance at		Beginning		(credits) to				Balance at
		beginning		balance from		operating		Write-offs		end of
		of year		acquisition		expenses		of accounts		year
		(In thousands)
Allowance for doubtful accounts receivable:
Year ended April 30, 2011	$	262	$	207	$	160	$	(126)	$	503
Year ended April 30, 2012		503		-		(14)		(144)		345
Year ended April 30, 2013		345		-		130		(197)		278
Allowance for long-term accounts
receivable – reflected in other assets:
Year ended April 30, 2011	$	82	$	-	$	9	$	-	$	91
Year ended April 30, 2012		91		-		8		(99)		-
Year ended April 30, 2013		-		-		-		-		-

Summary Of Fair Value Assumptions

		Year Ended
		April 30,
		2013		2012		2011
Expected term (in years)		4.0		4.0		4.0
Risk-free interest rate		0.5	%	1.1	%	1.3	%
Volatility		77	%	89	%	84	%
Dividend yield		-		-		-
Weighted-average fair value of stock options granted during the year	$	1.01	$	2.38	$	3.38