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8. Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of product warranty liabilities
(Dollars in thousands)   Three Months Ended
March 31,
    2017   2016  
Balance, January 1   $ 14   $ 16  
Accruals for warranties issued     3     3  
Settlements made (in cash or in kind)     (1 )   (2 )
Balance, end of period   $ 16   $ 17