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Accrued maintenance liability | 12 Months Ended
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Dec. 31, 2019
Accrued Maintenance Liability [Abstract] |
Accrued maintenance liability | Accrued maintenance liability Movements in accrued maintenance liability during the years ended December 31, 2019 and 2018 were as follows:
| Year Ended December 31,
| 2019 |  | 2018
Accrued maintenance liability at beginning of period | $ | 2,237,494 |  |  | $ | 2,461,799 |
Maintenance payments received | 736,423 |  |  | 743,256 |
Maintenance payments returned | (352,032 | ) |  | (459,326 | )
Release to income upon sale | (249,187 | ) |  | (261,240 | )
Release to income other than upon sale | (207,849 | ) |  | (228,081 | )
Lessor contribution, top ups and other | 25,310 |  |  | (18,914 | )
Accrued maintenance liability at end of period | $ | 2,190,159 |  |  | $ | 2,237,494 |

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