4.	Accounts Receivable and Significant Concentrations

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

	MARCH 31,		DECEMBER 31,
	2016		2015
	(Unaudited)
Commercial	$	3,210,857	$	2,616,702
Government		3,988,521		8,021,789
Gross accounts receivable		7,199,378		10,638,491
Less: allowances for doubtful
accounts		(76,486)		(73,378)

Accounts receivable, net	$	7,122,892	$	10,565,113

For the three month periods ended March 31, 2016 and 2015, respectively, the Company had no material recoveries of accounts receivable for which an allowance had been previously established.

Significant Concentrations

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

	MARCH 31,			DECEMBER 31,
	2016			2015
	As a % of			As a % of
Customer Name	Receivables			Receivables
	(Unaudited)
Department of Homeland Security (“DHS”)		41	%		51	%
US Airforce		--			14	%

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
	MARCH 31,
	2016				2015
	As a % of			As a % of
Customer Name	Revenues			Revenues
	(Unaudited)
Department of Homeland Security (DHS)		65	%		49	%