Revenue and Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2012

Revenue and Accounts Receivable [Abstract]

Accounts Receivable Components

The components of accounts receivable are as follows (in thousands):

	December 31,
	2012			2011
Billed accounts receivable	$	21,476		$	26,299
Unbilled receivables		12,722			11,022
Allowance for doubtful accounts		(319	)		(375	)
	$	33,879		$	36,946

Allowance for Doubtful Accounts

The activities in the allowance for doubtful accounts are set forth below (in thousands):

	Balance Beginning of Year		Bad Debt Expenses (1)			Deductions (2)			Balance End  of Year
Year ended December 31, 2012	$	375	$	(53	)	$	(3	)	$	319
Year ended December 31, 2011	$	358	$	17		$	----		$	375
Year ended December 31, 2010	$	363	$	(3	)	$	(2	)	$	358

(1) Accounts receivable reserves and reversal of allowance for subsequent collections, net

(2) Accounts receivable written-off and subsequent recoveries, net

Revenue by Customer Sector

         We derived substantially all of our revenues from contracts and subcontracts with the U.S. Government.  Revenue by customer sector for the last three fiscal years is as follows:

	2012				2011				2010
					(dollar amounts in thousands)
Federal	$	224,010	99.1%		$	188,162	99.1%		$	220,017	97.4%
Commercial		2,086	0.9%			1,726	0.9%			5,780	2.6%
Total	$	226,096	100.0	%	$	189,888	100.0	%	$	225,797	100.0	%