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Note 7 - Changes in Warranty Reserve (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Beginning balance $ 292,379 $ 325,107 $ 315,618 $ 314,311
Warranty provision 48,570 21,476 26,303 40,674
Warranty settlements (23,127) (19,347) (24,099) (27,749)
Ending balance $ 317,822 $ 327,236 $ 317,822 $ 327,236