4. Loss Per Share

Basic loss per share excludes any dilutive effects of stock options, warrants, and convertible preferred stock. In periods where they are anti-dilutive, such amounts are excluded from the calculations of dilutive loss per share.

The following is a reconciliation of basic net loss per share to diluted net loss per share for the three months ended March 31, 2013 and 2012:

	Three Months Ended
	March 31,
(Amounts in Thousands, Except for Per Share Amounts)	2013			2012
Loss per share from continuing operations attributable to Perma-Fix Environmental Services, Inc. common stockholders
Loss from continuing operations	$	(2,888	)	$	(807	)
Basic loss per share	$	(.05	)	$	(.02	)
Diluted loss per share	$	(.05	)	$	(.02	)

Loss per share from discontinued operations attributable to Perma-Fix Environmental Services, Inc. common stockholders
Loss from discontinued operations	$	(27	)	$	(138	)
Basic loss per share	$	─		$	─
Diluted loss per share	$	─		$	─

Weighted average common shares outstanding – basic		56,272			56,062
Potential shares exercisable under stock option plans		─			─
Weighted average common shares outstanding – diluted		56,272			56,062


Potential shares excluded from above weighted average share calculations due to their anti-dilutive effect include:
Upon exercise of options		2,234			1,827