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Note 9 - Warranty (Detail) - Warrant Liability (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Warranty reserve balance at beginning of period	$ 163	$ 165
Expense accrued, including adjustments	(3)	147
Warranty costs incurred	(62)	(125)
Warranty reserve balance at end of period	$ 98	$ 187

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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