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Other Assets | 12 Months Ended
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Sep. 30, 2021
Other Assets |
Other Assets | 7. Other Assets ​ Other assets consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, |  | September 30,
​ | ​ | 2021 | ​ | 2020
Intangible assets, net of accumulated amortization of $634,032 at September 30, 2021 and $583,655 at September 30, 2020 | ​ | $ | 62,474 | ​ | $ | 112,851
Operating lease right-of-use assets | ​ | ​ | 42,976 | ​ | ​ | 45,126
Other non-current assets | ​ |  | 82,834 | ​ |  | 91,566
​ | ​ | $ | 188,284 | ​ | $ | 249,543
​ Intangible assets consist of licensing and certification rights which are amortized over a defined number of units. No impairment charges were recorded in fiscal 2021, 2020 or 2019. ​ Total intangible amortization expense was $50,377, $32,618 and $19,400 in fiscal years 2021, 2020 and 2019, respectively. The timing of future amortization expense is not determinable because the intangible assets are being amortized over a defined number of units. ​ Other non-current assets as of September 30, 2021 and September 30, 2020 include the security deposit for an airplane hangar, and a deposit for medical claims required under the Company’s medical plan. In addition, other non-current assets include $7,535 and $16,266 of prepaid software licenses, that will be earned upon the shipment of a certain product to a customer, as of September 30, 2021, and September 30, 2020, respectively.

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