Accrued maintenance liability (Tables)
|6 Months Ended|
Jun. 30, 2021
|Accrued Maintenance Liability [Abstract]|
|Schedule of movements in accrued maintenance liability||
Movements in accrued maintenance liability during the six months ended June 30, 2021 and 2020 were as follows:
Schedule Of Movements In Accrued Maintenance Liability [Table Text Block]
No definition available.