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3. Inventories (Details) - USD ($) | Sep. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Inventories Details |  |  |
Raw materials | $ 468,578 | $ 332,804 | $ 440,723
Work in process | 22,383 | 0 |
Finished goods (including $142,600 and $85,600 held by customers at September 30, 2015 and December 31, 2014, respectively) (including $304,500 and $85,600 held by customers at December 31, 2013 and 2014, respectively) | 896,848 | 1,391,703 | 1,273,358
Total inventories | $ 1,387,809 | $ 1,724,507 | $ 1,714,081

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