SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2012

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]

Customers accounting for 10% or more of total revenues generated from continuing operations

The following customers accounted for 10% or more of the total revenues generated from continuing operations for twelve months ended December 31, 2012, 2011, and 2010:

		Total		% of Total
Customer	Year	Revenue		Revenue
CH Plateau Remediation Company ("CHPRC")	2012	$	24,652,000		19.3	%
	2011	$	59,136,000		50.1	%
	2010	$	51,929,000		53.1	%
Department of Energy ("DOE"):	2012	$	26,265,000		20.6	%
	2011	$	4,136,000		3.5	%
	2010	$	0		0.0	%

Receivable balance for each customer representing more than 10% of consolidated receivable

The outstanding receivable balance for each customer representing more than 10% of consolidated accounts receivable is ("AR") as follows:

		Total		% of Total
Customer	Year	AR		AR
DOE	2012	$	1,753,000		15.4	%
	2011	$	2,656,000		15.8	%
Clauss Construction	2012	$	3,343,000		29.3	%
	2011	$	3,114,000		18.5	%

Reconciliation of basic net income (loss) per share to diluted net (loss) income per share

The following is a reconciliation of basic net (loss) income per share to diluted net (loss) income per share for the years ended December 31, 2012, 2011, and 2010:

(Amounts in Thousands, Except for Per Share Amounts)	2012			2011		2010
(Loss) income per share from continuing operations attributable to Perma-Fix Environmental Services, Inc. common stockholders
(Loss) income from continuing operations	$	(6,550	)	$	11,572	$	3,271
Basic (loss) income per share	$	(.12	)	$	.21	$	.06
Diluted (loss) income per share	$	(.12	)	$	.21	$	.06
Income (loss) per share from discontinued operations attributable to Perma-Fix Environmental Services, Inc. common stockholders
Income (loss) from discontinued operations	$	458		$	777	$	(663	)
Basic income (loss) per share	$	.01		$	.01	$	(.01	)
Diluted income (loss) per share	$	.01		$	.01	$	(.01	)
Income per share from disposal of discontinued operations attributable to Perma-Fix Environmental Services, Inc. common stockholders
Gain on disposal of discontinued operations	$	¾		$	1,509	$	¾
Basic income per share	$	¾		$	.03	$	¾
Diluted income per share	$	¾		$	.03	$	¾
Weighted average common shares outstanding – basic		56,125			55,295		54,947
Potential shares exercisable under stock option plans		¾			22		56
Potential shares upon exercise of warrants		¾			¾		27
Weighted average common shares outstanding – diluted		56,125			55,317		55,030

Potential shares excluded from above weighted average share calculations due to their anti-dilutive effect

Potential shares excluded from above weighted average share calculations due to their anti-dilutive effect include:
Upon exercise of options	2,584	2,549	2,195
Upon exercise of Warrants	¾	150	¾