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Lease Commitments - Operating and financing leases - (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Lease Commitments    
Operating lease, Within 1 year $ 118 $ 118
Operating lease, After 1 year but within 2 years 120 120
Operating lease, After 2 years but within 3 years 85 98
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 573 589
Total undiscounted cash flows 1,034 1,063
Discount on cash flows (192) (198)
Total lease liabilities 842 865
Financing lease, Within 1 year 302 296
Financing lease, After 1 year but within 2 years 289 275
Financing lease, After 2 years but within 3 years 291 277
Financing lease, After 3 years but within 4 years 276 274
Financing lease, After 4 years but within 5 years 251 236
Financing lease, After 5 years 2,943 3,007
Total undiscounted cash flows 4,352 4,365
Discount on cash flows (1,175) (1,202)
Total lease liabilities $ 3,177 $ 3,163