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Note 7 - Accrued Liabilities and Other Liabilities - Changes in Warranty Reserve (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Beginning balance $ 449,141 $ 317,822 $ 356,984 $ 315,618
Warranty provision (2,761) 4,307 108,608 30,610
Warranty settlements (46,201) (7,850) (65,413) (31,949)
Ending balance $ 400,179 $ 314,279 $ 400,179 $ 314,279