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Note 6 - Commitment and Contingencies (Tables)
12 Months Ended
Dec. 31, 2014
Note 6 - Commitment And Contingencies Tables  
Changes in product warranty liability

   2014  2013
Balance, January 1  $513   $607 
Accrual for warranties issued   122    20 
Settlements made   (259)   (114)
Balance, December 31  $376   $513