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Note 7 - Accrued Liabilities and Other Liabilities - Changes in Warranty Reserve (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Beginning balance $ 353,938 $ 292,379 $ 356,984 $ 315,618
Warranty provision 101,673 48,570 111,369 26,303
Warranty settlements (6,470) (23,127) (19,212) (24,099)
Ending balance $ 449,141 $ 317,822 $ 449,141 $ 317,822