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Note 7 - Short-term and Long-term Warranty Reserves (Details) - USD ($)
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Short-term warranty reserve $ 289,660 $ 253,801   $ 289,660      
Long-term warranty reserve 25,958 64,021   25,958      
Total warranty reserve $ 315,618 $ 317,822 $ 292,379 $ 315,618 $ 327,236 $ 325,107 $ 314,311