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7. Leases (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]    
Operating lease cost $ 443 $ 446
Cash paid for amounts included in the measurement of lease liabilities 432 433
Operating cash flows from operating leases 0 0
Right-of-use assets obtained in exchange for new lease liabilities - operating leases $ 132 $ 0
Weighted-average remaining lease term - operating leases 7 years 11 days 7 years 18 days
Weighted-average discount rate - operating leases 3.13% 3.17%