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Other Assets | 12 Months Ended
--- | ---
Sep. 30, 2018
Other Assets |
Other Assets | 8. Other Assets Other assets consist of the following:
|  | September 30, |  | September 30,
|  | 2018 |  | 2017
Intangible assets, net of accumulated amortization of $531,637 at September 30, 2018 and September 30, 2017 |  | $ | 68,600 |  | $ | 68,600
Other non-current assets |  |  | 113,393 |  |  | 118,715
|  | $ | 181,993 |  | $ | 187,315
Intangible assets consist of licensing and certification rights which are amortized over a defined number of units. No impairment charges were recorded in fiscal 2018, 2017 or 2016. Total intangible amortization expense was approximately $0, $2,600 and $12,000 in fiscal years 2018, 2017 and 2016, 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, 2018 and September 30, 2017 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 as of September 30, 2018 includes $38,000 of prepaid software licenses that will be earned upon the shipment of a certain product to a customer.

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