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Other assets: | 12 Months Ended
--- | ---
Sep. 30, 2013
Other assets: |
Other assets: | 8. Other assets: Other assets consist of the following:
|  | September 30, |  | September 30, |
|  | 2013 |  | 2012 |
Intangible assets, net of accumulated amortization of $495,037 and $441,637 at September 30, 2013 and September 30, 2012 |  | $ | 105,200 |  | $ | 158,600 |
Other non-current assets |  | 116,333 |  | — |
|  | $ | 221,533 |  | $ | 158,600 |
Intangible assets consist of licensing and certification rights which are amortized over a defined number of units. No impairment charges were recorded in fiscal 2013, 2012 or 2011. Total intangible amortization expense was approximately $0.1 million in each of fiscal years 2013, 2012 and 2011. 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 are advanced payments made to vendors to secure end-of-life purchases of materials that are not expected to be applied during the next twelve months.

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