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Accrued maintenance liability | 6 Months Ended
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Jun. 30, 2019
Accrued Maintenance Liability [Abstract] |
Accrued maintenance liability | Accrued maintenance liability Movements in accrued maintenance liability during the six months ended June 30, 2019 and 2018 were as follows:
| Six Months Ended June 30,
| 2019 |  | 2018
Accrued maintenance liability at beginning of period | $ | 2,237,494 |  |  | $ | 2,461,799 |
Maintenance payments received | 358,694 |  |  | 362,801 |
Maintenance payments returned | (206,456 | ) |  | (276,144 | )
Release to income upon sale | (64,066 | ) |  | (169,678 | )
Release to income other than upon sale | (87,061 | ) |  | (113,184 | )
Lessor contribution, top ups and other | 4,148 |  |  | (12,803 | )
Accrued maintenance liability at end of period | $ | 2,242,753 |  |  | $ | 2,252,791 |

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- Definition Accrued Maintenance Liability [Text Block] + References No definition available. + Details
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