Annual report pursuant to Section 13 and 15(d)

Accrued Expenses - Accrued Expenses Schedule (Details)

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Accrued Expenses - Accrued Expenses Schedule (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accrued compensation $ 247,343 $ 519,485  
Warranty reserve 426,115 335,893 $ 358,296
Other 407,697 293,751  
Accrued expenses $ 1,081,155 $ 1,149,129