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Note 9 - Accrued and Other Liabilities - Noncurrent - Short-term and Long-term Warranty Reserves (Details) - USD ($)
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Short-term warranty reserve $ 179,101 $ 285,402  
Long-term warranty reserve 71,582  
Total warranty reserve $ 179,101 $ 356,984 $ 315,618