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Note 6 - Commitments and Contingencies (Detail) - Changes in product warranty liability (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Balance $ 839 $ 1,314
Accruals for warranties issued 370 591
Settlements made (602) (1,066)
Balance $ 607 $ 839