Product Warranty

9 Months Ended

Jan. 31, 2012

NOTE H--PRODUCT WARRANTY

The Company estimates outstanding warranty costs based on the historical relationship between warranty claims and revenues. The warranty accrual is reviewed monthly to verify that it properly reflects the remaining obligation based on the anticipated expenditures over the balance of the obligation period. Adjustments are made when actual warranty claim experience differs from estimates. Warranty claims are generally made within three months of the original shipment date.

The following is a reconciliation of the Company's warranty liability:

	Nine Months Ended
	January 31
(in thousands)	2012			2011
Beginning balance at May 1	$	1,738		$	1,582
Accrual		6,337			5,035
Settlements		(6,384	)		(5,072	)

Ending balance at January 31	$	1,691		$	1,545