3. Receivables (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 0	$ 0
Accounts receivable, net	652,839	615,714
Billed-federal government
Accounts receivable gross	612,679	560,942
Billed-commercial and other
Accounts receivable gross	40,160	49,240
Total billed
Accounts receivable gross	652,839	610,182
Unbilled
Accounts receivable gross	$ 0	$ 5,532

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.

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For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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

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Unbilled amounts (net of unliquidated progress payments) of government contract receivables.

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No definition available.

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