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Note 7 - Accrued Liabilities and Other Liabilities - Changes in Warranty Reserve (Details) - USD ($)
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Beginning balance $ 356,984 $ 315,618
Warranty provision 9,696 (22,267)
Warranty settlements (12,742) (972)
Ending balance $ 353,938 $ 292,379