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Accrued maintenance liability
 6 Months Ended
Jun. 30, 2020
Accrued Maintenance Liability [Abstract]  
Accrued maintenance liability Accrued maintenance liability
Movements in accrued maintenance liability during the six months ended June 30, 2020 and 2019 were as follows:
Six Months Ended June 30,
20202019
Accrued maintenance liability at beginning of period$2,190,159  $2,237,494  
Maintenance payments received194,779  358,694  
Maintenance payments returned(208,630) (206,456) 
Release to income upon sale(86,592) (64,066) 
Release to income other than upon sale(224,207) (87,061) 
Lessor contribution, top ups and other65,365  4,148  
Accrued maintenance liability at end of period$1,930,874  $2,242,753