Accounts Receivable (Details Textual) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Accounts Receivable [Abstract]
Allowances for doubtful accounts	$ 785,895		$ 839,895	[1]
Provision for doubtful accounts	0		810,580
Collection of doubtful accounts	54,000
Accounts receivable write offs	$ 0		$ 4,920

[1] The allowance for doubtful accounts is primarily due to unpaid billings on a contract that is currently in dispute.