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Note 9 - Commitment and Contingencies (Tables)
12 Months Ended
Dec. 31, 2015
Note 9 - Commitment And Contingencies Tables  
Changes in product warranty liability

   2015  2014
Balance, January 1  $376   $513 
Provision (reversal) for warranties issued   (90)   122 
Settlements made   (94)   (259)
Balance, December 31  $192   $376