Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses (Details)

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Accrued Expenses (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Accounts Payable and Accrued Liabilities, Current [Abstract]    
Accrued compensation $ 495,138 $ 519,485
Warranty reserve 357,901 335,893
Other 397,445 293,751
Accrued expenses, total $ 1,250,484 $ 1,149,129