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Note 10 - Accrued and Other Liabilities - Changes in Warranty Reserve (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Beginning balance $ 99,216 $ 104,518
Warranty provision 20,618 6,093
Warranty settlements (4,789) (11,395)
Ending balance $ 115,045 $ 99,216