Accounts Receivable (Details 1) - Trade Accounts Receivable [Member] - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Allowance for Doubtful Accounts Receivable [Roll Forward]
Accounts receivable allowance, beginning of year	$ 165,840	$ 181,473
Provision adjustment	0	125,405
Write-off	0	(141,038)
Accounts receivable allowance, end of period	$ 165,840	$ 165,840