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Note 6 - Accrued Liabilities and Other Liabilities - Noncurrent (Details) - Changes in Warranty Reserve (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Changes in Warranty Reserve [Abstract]        
Beginning balance $ 215,758 $ 190,593 $ 212,759 $ 204,313
Warranty provision 69,157 15,913 83,518 6,468
Warranty settlements (24,707) (1,501) (36,069) (5,776)
Ending balance $ 260,208 $ 205,005 $ 260,208 $ 205,005