Accounts Receivable and Significant Concentrations (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Accounts receivable, gross	$ 11,333,174	$ 11,196,048
Less: allowances for doubtful accounts	112,754	106,733
Accounts receivable, net	11,220,420	11,089,315
Government [Member]
Accounts receivable, gross	8,689,290	7,332,338
Commercial [Member]
Accounts receivable, gross	$ 2,643,884	$ 3,863,710

For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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