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Lease Commitments - Operating and financing leases - (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Lease Commitments    
Operating lease, Within 1 year $ 120 $ 120
Operating lease, After 1 year but within 2 years 85 98
Operating lease, After 2 years but within 3 years 69 69
Operating lease, After 3 years but within 4 years 69 69
Operating lease, After 4 years but within 5 years 69 69
Operating lease, After 5 years 504 520
Total undiscounted cash flows 916 945
Discount on cash flows (164) (169)
Total lease liabilities 752 776
Financing lease, Within 1 year 317 316
Financing lease, After 1 year but within 2 years 320 320
Financing lease, After 2 years but within 3 years 290 309
Financing lease, After 3 years but within 4 years 251 249
Financing lease, After 4 years but within 5 years 231 248
Financing lease, After 5 years 2,714 2,760
Total undiscounted cash flows 4,123 4,202
Discount on cash flows (1,066) (1,093)
Total lease liabilities $ 3,057 $ 3,109