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Note 9 - Accrued Liabilities - Changes in Warranty Reserve (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Beginning balance $ 188,308 $ 353,938 $ 179,101 $ 356,984
Warranty provision 101,673 12,361 111,369
Warranty settlements (19,104) (6,470) (22,258) (19,212)
Ending balance $ 169,204 $ 449,141 $ 169,204 $ 449,141