Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses (Details)

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Accrued Expenses (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Accounts Payable and Accrued Liabilities, Current [Abstract]    
Accrued compensation $ 489,132 $ 519,485
Warranty reserve 308,955 335,893
Other 232,874 293,751
Accrued expenses, total $ 1,030,961 $ 1,149,129