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.