Accounts payable and accrued expenses (Tables)

6 Months Ended

Jun. 30, 2018

Payables and Accruals [Abstract]

Components of accounts payable and accrued expenses

Accounts payable and accrued expenses are as follows:

	June 30, 2018		December 31, 2017
Outstanding checks in excess of cash	$	7,325	8,879
Accounts payable, trade	951,200		810,034
Accrued expenses	384,147		363,919
Product warranties	38,973		39,035
Accrued interest	16,725		22,363
Accrued compensation and benefits	191,191		207,442
Total accounts payable and accrued expenses	$	1,589,561	1,451,672