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6. Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Payroll and incentive compensation $ 2,208 $ 1,560
Real estate tax 371 394
Other 405 215
Total accrued expenses $ 2,984 $ 2,169