4.	Accounts Receivable and Unbilled Accounts Receivable

Accounts receivable consist of the following for each of the periods presented below:

	JUNE 30,			DECEMBER 31,
	2013			2012
	(Unaudited)
Commercial	$	2,321,127		$	2,546,268
Government		2,938,726			4,462,984
Gross accounts receivable		5,259,853			7,009,252
Less: allowances for doubtful accounts		(30,527	)		(76,886	)

Accounts receivable, net	$	5,229,326		$	6,932,366

Unbilled accounts receivable consist of the following for each of the periods presented below:

	JUNE 30,		DECEMBER 31,
	2013		2012
	(Unaudited)
Commercial	$	341,053	$	1,564,078
Government		943,415		1,405,372

Unbilled accounts receivable	$	1,284,468	$	2,969,450

Customers representing ten percent or more of consolidated revenues are set forth in the table below for each of the periods presented:

	THREE MONTHS ENDED						SIX MONTHS ENDED
	JUNE 30,						JUNE 30,
	2013			2012			2013			2012
	As a % of			As a % of			As a % of			As a % of
Customer Name	Revenues			Revenues			Revenues			Revenues
	(Unaudited)						(Unaudited)
Transportation Security Administration ("TSA")		20	%		19	%		19	%		18	%
Department of Homeland Security ("DHS")		18	%		17	%		18	%		17	%
Lockheed Martin Corporation		--			--			11	%		--
Maryland Procurement		--			11	%		--			8	%

Customers representing ten percent or more of consolidated trade accounts receivable are set forth in the table below for each of the periods presented:

	JUNE 30,			DECEMBER 31,
	2013			2012
	As a % of			As a % of
Customer Name	Receivables			Receivables
	(Unaudited)
Transportation Security Administration ("TSA")		12	%		12	%
Department of Homeland Security ("DHS")		13	%		19	%
Bureau of Alcohol Tabacco and Firearms ("ATF")		--			10	%