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Note 6 - Accrued Liabilities and Other Liabilities - Noncurrent (Details) - Changes in Warranty Reserve (USD $)
3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Changes in Warranty Reserve [Abstract]        
Beginning balance $ 260,208 $ 205,005 $ 212,759 $ 204,313
Warranty provision 64,369 (7,302) 147,887 (834)
Warranty settlements (4,906) (5,809) (40,975) (11,585)
Ending balance $ 319,671 $ 191,894 $ 319,671 $ 191,894