operating and finance leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Liabilities
Operating leases	$ 68	$ 61	$ 147	$ 123
Amortization of leased assets	25	25	51	51
Interest on finance leases	36	36	69	71
Total lease cost	$ 129	$ 122	$ 267	$ 245
Weighted Average Remaining Lease Term
Operating leases	7 years 146 days		7 years 146 days		7 years 219 days
Financing leases	13 years 328 days 12 hours		13 years 328 days 12 hours		14 years 73 days
Weighted Average Discount Rate 1
Operating leases	3.80%		3.80%		3.70%
Financing leases	8.30%		8.30%		8.40%
Assets And Liabilities [Member]
Assets
Operating	$ 1,074		$ 1,074		$ 1,182
Finance	1,352		1,352		1,402
Total Leased Assets	2,426		2,426		2,584
Liabilities
Finance	1,646		1,646		1,673
Total lease liabilities	$ 2,720		$ 2,720		$ 2,855