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Note 9 - Accrued Liabilities - Changes in Warranty Reserve (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Beginning balance $ 169,204 $ 449,141 $ 179,101 $ 356,984
Warranty provision (2,761) 12,361 108,608
Warranty settlements (20,344) (46,201) (42,602) (65,413)
Ending balance $ 148,860 $ 400,179 $ 148,860 $ 400,179