Accounts Receivable and Significant Concentrations (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Accounts receivable, gross	$ 7,985,217	$ 11,196,048
Less: allowances for doubtful accounts	117,120	106,733
Accounts receivable, net	7,868,097	11,089,315
Government [Member]
Accounts receivable, gross	5,370,956	7,332,338
Commercial [Member]
Accounts receivable, gross	$ 2,614,261	$ 3,863,710

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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