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Note 7 - Commitments and Contingencies - Changes in Produce Warranty Liability (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Accrued Warranty Obligation, Beginning $ 192 $ 376
Provision (reversal) for warranties issued 39 (90)
Settlements made (59) (94)
Accrued Warranty Obligation, Ending $ 172 $ 192