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Note 10 - Accrued Liabilities - Changes in Warranty Reserve (Details) - USD ($)
9 Months Ended 12 Months Ended
Jun. 30, 2019
Sep. 30, 2018
Beginning balance $ 99,216 $ 104,518
Warranty provision 62,689 6,093
Warranty settlements (30,287) (11,395)
Ending balance $ 131,618 $ 99,216