Accrued Expenses (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Accrued Expenses (Details)
Accrued expenses, other	$ 208,278	$ 174,489
Accrued interest	613,349	436,581
Accrued warranty costs	91,531	91,531
Accrued Expenses	$ 913,158	$ 702,601