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13. Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Schedule for product warranties
    Balance at Beginning of Year     Warranties Issued     Warranties Settled     Balance at End of Year  
2019   $ 1,546     $ 606     $ (904 )   $ 1,248  
2018   $ 1,389     $ 1,329     $ (1,172 )   $ 1,546