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Segment information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Oil and Gas operations |  |  |
Operating revenue | $ 764 | $ 820 | $ 1,489
Operating expenses | 687 | 1,183 | 1,233
Depreciation, depletion and amortization | 494 | 617 | 620
Lease of Retirement Center | 0 | 0 | 0
Impairment of oil and gas properties | 0 | 2,717 | 0
Total Operating Expenses | 1,181 | 4,517 | 1,853
Interest Income | 23 | 0 | 0
Interest expense | (38) | (62) | (91)
Gain on prepayment of debt | 888 | 0 | 0
Other income | 0 | 0 | (19)
Segment operating income (loss) | 456 | (3,759) | (474)
Assets Oil and Gas operations | 6,641 | 7,420 | 10,621
Corporate |  |  |
Operating revenue Corporate | 0 | 0 | 0
Operating expenses Corporate | 352 | 605 | 823
Total Operating Expenses Corporate | 352 | 605 | 823
Interest Income Corporate | 0 | 12 | 5
Gain on Sale of Land Corporate | 50 | 0 | 0
Bad debt recovery Corporate | 0 | 1,430 | 0
Other income Corporate | (110) | (32) | 216
Segment operating income (loss) Corporate | (412) | 805 | (602)
Assets Oil and Gas operations Corporate | 291 | 1,025 | 1,208
Total |  |  |
Operating revenue Total | 764 | 820 | 1,489
Operating expenses Total | 1,039 | 1,788 | 2,056
Depreciation, depletion and amortization Total | 494 | 617 | 620
Impairment of oil and gas properties Total | 0 | 2,717 | 0
Total Operating Expenses Total | 1,533 | 5,122 | 2,676
Interest Income Total | 23 | 12 | 5
Interest expense Total | (38) | (62) | (91)
Gain on prepayment of debt Total | 888 | 0 | 0
Bad debt recovery Total | 0 | 1,430 | 0
Gain on Sale of Land Total | 50 | 0 | 0
Other income Total | (110) | (32) | 197
Segment operating income (loss) Total | 44 | (2,954) | (1,076)
Assets Oil and Gas operations Total | 6,932 | 8,445 | 11,829
Discontinued Operations Retirement Facility |  |  |
Operating revenue Discontinued Operations Retirement Facility | 2,665 | 2,997 | 2,874
Operating expenses Discontinued Operations Retirement Facility | 1,496 | 1,623 | 1,551
Depreciation, depletion and amortization Discontinued Operations Retirement Facility | 168 | 62 | 65
Lease of Retirement Center Discontinued Operations Retirement Facility | 997 | 980 | 961
Total Operating Expenses Discontinued Operations Retirement Facility | 2,661 | 2,665 | 2,577
Segment operating income (loss) Discontinued Operations Retirement Facility | 4 | 332 | 297
Assets Oil and Gas operations Discontinued Operations Retirement Facility | $ 246 | $ 430 | $ 445

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