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Note 6 - Accrued Liabilities and Other Liabilities - Noncurrent (Details) - Short-term and Long-term Warranty Reserves (USD $)
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Short-term and Long-term Warranty Reserves [Abstract]            
Short-term warranty reserve $ 230,292   $ 189,277      
Long-term warranty reserve 29,916   23,482      
$ 260,208 $ 215,758 $ 212,759 $ 205,005 $ 190,593 $ 204,313