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6. Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Payroll and incentive compensation $ 1,937 $ 2,208
Real estate tax 398 371
Other 442 405
Total accrued expenses $ 2,777 $ 2,984