Accounts payable and accrued expenses (Tables)

3 Months Ended

Mar. 31, 2018

Payables and Accruals [Abstract]

Components of accounts payable and accrued expenses

Accounts payable and accrued expenses are as follows:

	March 31, 2018		December 31, 2017
Outstanding checks in excess of cash	$	1,974	8,879
Accounts payable, trade	897,525		810,034
Accrued expenses	334,879		363,919
Product warranties	40,456		39,035
Accrued interest	8,155		22,363
Accrued compensation and benefits	181,004		207,442
Total accounts payable and accrued expenses	$	1,463,993	1,451,672