Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses (Details)

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Accrued Expenses (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Accounts Payable and Accrued Liabilities, Current [Abstract]    
Accrued compensation $ 423,819 $ 519,485
Warranty reserve 398,079 335,893
Other 358,384 293,751
Accrued expenses, total $ 1,180,282 $ 1,149,129