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8. Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of product warranty liabilities
(Dollars in thousands)  Six Months Ended
June 30,
 
   2017   2016 
Balance, January 1  $14   $16 
Accruals for warranties issued   8    7 
Settlements made (in cash or in kind)   (10)   (3)
Balance, end of period  $12   $20