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Note 8 - Prepaid Maintenance Agreement
 12 Months Ended
Sep. 30, 2017
Notes to Financial Statements  
Prepaid Maintenance Agreement Disclosure [Text Block]
8
. PREPAID MAINTENANCE AGREEMENT
 
At
March
 
31,
2011,
prepaid expenses included
$1,500,000
paid to a
third
party service provider in connection with the Company’s obligations under a sales contract to a foreign military service to provide repair and maintenance services over an
eight
year period for products sold thereunder. The total prepaid expense is being amortized on a straight-line basis at an annual rate of
$187,500
over the
eight
-year contract period to correspond with the revenues for these services, and is being recognized as a component of cost of sales. Accordingly, as of
September 
30,
2017,
$187,500
of the total prepayment was classified as a current asset and
$93,750
was classified as noncurrent. As of
September 30, 2016,
$187,500
of the total prepayment was classified as a current asset and
$281,250
was classified as noncurrent.