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7. Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Leases [Abstract]    
Operating lease cost $ 195 $ 224
Cash paid for amounts included in the measurement of lease liabilities 189 218
Operating cash flows from operating leases 0 0
Right-of-use assets obtained in exchange for new lease liabilities - operating leases $ 0 $ 0
Weighted-average remaining lease term - operating leases 6 years 11 months 12 days 7 years 2 months 12 days
Weighted-average discount rate - operating leases 2.69% 3.20%