8.GUARANTEES

Certain of the Company’s products carry a one-year warranty, the costs of which are accrued for at the time of shipment or delivery. Accrual rates are based upon historical experience for the trailing twelve months and management’s judgment of future exposure. Warranty experience for the three months ended June 30, 2015 and 2014 was as follows:

	Three Months Ended
(In thousands)	June 30, 2015			June 30, 2014
Warranty accrual at beginning of period	$	159		$	404
Accruals for warranties issued during the period	91			42
Adjustment of preexisting accrual estimates	35			(144		)
Warranty costs incurred during period	(97		)	(56		)

Warranty accrual at end of period	$	188		$	246