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Note 9 - Accrued and Other Liabilities - Changes in Warranty Reserve (Details) - USD ($)
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Beginning balance $ 356,984 $ 315,618
Warranty provision (109,925) 79,954
Warranty settlements (67,958) (38,588)
Ending balance $ 179,101 $ 356,984