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Note 7 - Accrued Liabilities and Other Liabilities - Noncurrent - Short-term and Long-term Warranty Reserves (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Short-term warranty reserve $ 409,031   $ 285,402      
Long-term warranty reserve 40,110   71,582      
Total warranty reserve $ 449,141 $ 353,938 $ 356,984 $ 317,822 $ 292,379 $ 315,618