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Note 10 - Accrued and Other Liabilities - Changes in Warranty Reserve (Details) - USD ($)
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Beginning balance $ 99,216 $ 104,518
Warranty provision 85,078 6,093
Warranty settlements (34,065) (11,395)
Ending balance $ 150,229 $ 99,216