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Accrued maintenance liability | 12 Months Ended
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Dec. 31, 2020
Accrued Maintenance Liability [Abstract] |
Accrued maintenance liability | Accrued maintenance liability Movements in accrued maintenance liability during the years ended December 31, 2020 and 2019 were as follows:
| Year Ended December 31,
| 2020 |  | 2019
Accrued maintenance liability at beginning of period | $ | 2,190,159 |  |  | $ | 2,237,494 |
Maintenance payments received | 345,699 |  |  | 736,423 |
Maintenance payments returned | (412,492) |  |  | (352,032) |
Release to income upon sale | (95,042) |  |  | (249,187) |
Release to income other than upon sale | (344,210) |  |  | (207,849) |
Lessor contribution, top ups and other | 66,281 |  |  | 25,310 |
Accrued maintenance liability at end of period | $ | 1,750,395 |  |  | $ | 2,190,159 |

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