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13. Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2015
Commitments And Contingencies Tables  
Schedule for product warranties
    Balance at Beginning of Year     Warranties Issued     Warranties Settled     Balance at End of Year  
2015   $ 384     $ 538     $ (384 )   $ 538  
2014   $ 292     $ 384     $ (292 )   $ 384