4. Accrued product warranty liability

6 Months Ended

Jun. 30, 2011

Product Warranty Disclosure [Text Block]

4. Accrued product warranty liability

We generally warrant our products for between 24 and 36 months and record the estimated cost of such product warranties at the time the sale is recorded. Estimated warranty costs are based upon actual past experience of product repairs and the related estimated cost of labor and material to make the necessary repairs.

The following table summarizes the activity recorded in the accrued product warranty liability during the six months ended June 30, 2011:

	Six months ended
(In thousands)	June 30, 2011
Balance, beginning of period	$	249
Accruals for warranties issued during the period		99
Changes in estimates		176
Settlements during the period		(154	)
Balance, end of period	$	370

The current portion of the accrued product warranty liability is included in accrued liabilities in the condensed consolidated balance sheets.