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Note 9 - Accrued and Other Liabilities - Noncurrent - Changes in Warranty Reserve (Details) - USD ($)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Beginning balance $ 315,618 $ 314,311
Warranty provision 79,954 42,645
Warranty settlements (38,588) (41,338)
Ending balance $ 356,984 $ 315,618