Annual report pursuant to section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

v2.4.0.8
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Segment
Permit
Phase
Dec. 31, 2011
Dec. 31, 2010
Segment
Dec. 31, 2009
Oct. 15, 2013
Restricted Cash [Line Items]                          
Restricted cash held in escrow for worker's compensation policy $ 35,000               $ 35,000        
Escrow deposit received                   1,500,000      
Accounts Receivable [Line Items]                          
Accounts receivable payment term                 payment within 30 or 60 days from the invoice date        
Minimum period to review accounts receivable                 60 days        
Minimum period for unbilled receivables                 12 months        
Property, Plant and Equipment [Line Items]                          
Tangible asset impairment                 0        
Depreciation expense                 4,795,000 4,575,000 4,451,000    
Capitalized Interest [Abstract]                          
Minimum period for construction of major projects to capitalize interest cost                 1 year        
Interest costs capitalized during the period                 0 0 0    
Goodwill and Other Intangible Assets [Abstract]                          
Number of reporting units                 4   2    
Goodwill [Line Items]                          
Reassignment of goodwill from change in reporting unit                   0 [1]      
Goodwill 29,186,000 [1]       29,186,000 [1],[2]       29,186,000 [1] 29,186,000 [1],[2] 15,330,000 [1]    
Number of definite lived permit                 1        
Permit capitalized amount                       545,000  
Amortization period of permit                 10 years        
Income Taxes [Abstract]                          
Minimum likelihood of tax benefit to be realized (in hundredths)                 50.00%        
Revenue Recognition [Abstract]                          
Number of processing phases                 3        
Self Insurance [Abstract]                          
Self-insurance reserve 644,000       475,000       644,000 475,000      
Self-insurance expenses for continuing operations                 4,388,000 3,041,000 2,896,000    
Self insurance expenses for discontinued operations                 171,000 311,000 314,000    
Comprehensive Income [Abstract]                          
Foreign currency translation gain (loss)                 1,000 (3,000) 0    
Income per share from continuing operations attributable to Perma-Fix Environmental Services, Inc. common stockholders [Abstract]                          
Basic (loss) income per share (in dollars per share) $ (0.08) $ (0.04) $ (0.10) $ (0.08) $ 0 $ 0.40 $ 0.23 $ (0.05) $ (0.3) $ 0.58 $ 0.44    
Diluted (loss) income per share (in dollars per share) $ (0.08) $ (0.04) $ (0.10) $ (0.08) $ 0 $ 0.40 $ 0.23 $ (0.05) $ (0.30) $ 0.58 $ 0.44    
Income (loss) per share from discontinued operations attributable to Perma-Fix Environmental Services, Inc. common stockholders [Abstract]                          
(Loss) income from discontinued operations                 (30,000) 182,000 (919,000)    
Basic income (loss) per share (in dollars per share) $ 0.02 $ (0.01) $ 0 $ (0.01) $ 0.01 $ (0.02) $ 0 $ 0.02 $ 0 $ 0.01 $ (0.08)    
Diluted income (loss) per share (in dollars per share) $ 0.02 $ (0.01) $ 0 $ (0.01) $ 0.01 $ (0.02) $ 0 $ 0.02 $ 0.00 $ 0.01 $ (0.08)    
Income per share from disposal of discontinued operations attributable to Perma-Fix Environmental Services, Inc. common stockholders [Abstract]                          
Gain on disposal of discontinued operations         (268,000) 1,777,000 0 0 0 [3] 1,509,000 [3] 0 [3]    
Weighted average common shares outstanding - basic (in shares)                 11,225,000 11,059,000 10,989,000    
Weighted average common shares outstanding - diluted (in shares)                 11,225,000 11,063,000 11,006,000    
Subsequent Events [Abstract]                          
Reverse Stock Split Ratio                         1-for-5
Number of authorized shares of Common Stock (in shares) 75,000,000       75,000,000       75,000,000 75,000,000     75,000,000
Stock Options [Member]
                          
Potential shares excluded from above weighted average share calculations due to their anti-dilutive effect include [Abstract]                          
Potential shares excluded from above weighted average share calculations due to their anti-dilutive effect (in shares)                 517,000 510,000 439,000    
Warrant [Member]
                          
Potential shares excluded from above weighted average share calculations due to their anti-dilutive effect include [Abstract]                          
Potential shares excluded from above weighted average share calculations due to their anti-dilutive effect (in shares)                 0 30,000 0    
Restated [Member]
                          
Income per share from continuing operations attributable to Perma-Fix Environmental Services, Inc. common stockholders [Abstract]                          
(Loss) income from continuing operations                 (3,329,000) 6,377,000 4,882,000    
Basic (loss) income per share (in dollars per share)                 $ (0.30) $ 0.58 $ 0.44    
Diluted (loss) income per share (in dollars per share)                 $ (0.30) $ 0.58 $ 0.44    
Income (loss) per share from discontinued operations attributable to Perma-Fix Environmental Services, Inc. common stockholders [Abstract]                          
(Loss) income from discontinued operations                 (30,000) 182,000 (919,000)    
Basic income (loss) per share (in dollars per share)                 $ 0 $ 0.01 $ (0.08)    
Diluted income (loss) per share (in dollars per share)                 $ 0 $ 0.01 $ (0.08)    
Income per share from disposal of discontinued operations attributable to Perma-Fix Environmental Services, Inc. common stockholders [Abstract]                          
Gain on disposal of discontinued operations                 0 1,509,000 0    
Basic income per share (in dollars per share)                 $ 0 $ 0.14 $ 0    
Diluted income per share (in dollars per share)                 $ 0 $ 0.14 $ 0    
Weighted average common shares outstanding - basic (in shares)                 11,225,000 11,059,000 10,989,000    
Potential shares exercisable under stock option plans (in shares)                 0 4,000 11,000    
Potential shares upon exercise of warrants (in shares)                 0 0 5,000    
Weighted average common shares outstanding - diluted (in shares)                 11,225,000 11,063,000 11,006,000    
Accounts Receivable [Member] | Clauss Construction [Member]
                          
Concentration Risk [Line Items]                          
Total AR 3,343,000       3,114,000       3,343,000 3,114,000      
Percent of Total A/R (in hundredths)                 29.30% 18.50%      
Accounts Receivable [Member] | Department of Energy ("DOE") [Member]
                          
Concentration Risk [Line Items]                          
Total AR 1,753,000       2,656,000       1,753,000 2,656,000      
Percent of Total A/R (in hundredths)                 15.40% 15.80%      
Revenue [Member] | Federal Government [Member]
                          
Concentration Risk [Line Items]                          
Revenue from major customer                 101,533,000 99,660,000 80,275,000    
Percentage of revenue from major customer (in hundredths)                 79.60% 84.50% 82.10%    
Revenue [Member] | CH Plateau Remediation Company [Member]
                          
Concentration Risk [Line Items]                          
Revenue from major customer                 24,652,000 59,136,000 51,929,000    
Percentage of revenue from major customer (in hundredths)                 19.30% 50.10% 53.10%    
Revenue [Member] | Department of Energy ("DOE") [Member]
                          
Concentration Risk [Line Items]                          
Revenue from major customer                 26,265,000 4,136,000 0    
Percentage of revenue from major customer (in hundredths)                 20.60% 3.50% 0.00%    
Treatment [Member]
                          
Goodwill [Line Items]                          
Reassignment of goodwill from change in reporting unit   2,488,000               (1,149,000) [1]      
Goodwill 13,691,000 [1]       13,691,000 [1]       13,691,000 [1] 13,691,000 [1] 14,000,000 [1]    
Reassignment of goodwill to correct initial calculation   2,488,000                      
CHPRC [Member]
                          
Goodwill [Line Items]                          
Reassignment of goodwill from change in reporting unit         3,637,000                
Goodwill   $ 3,637,000     $ 14,840,000         $ 14,840,000      
Building and Building Improvements [Member] | Minimum [Member]
                          
Property, Plant and Equipment [Line Items]                          
Property and equipment, useful life                 10 years        
Building and Building Improvements [Member] | Maximum [Member]
                          
Property, Plant and Equipment [Line Items]                          
Property and equipment, useful life                 40 years        
Office Furniture And Equipment [Member] | Minimum [Member]
                          
Property, Plant and Equipment [Line Items]                          
Property and equipment, useful life                 3 years        
Office Furniture And Equipment [Member] | Maximum [Member]
                          
Property, Plant and Equipment [Line Items]                          
Property and equipment, useful life                 7 years        
Vehicles [Member]
                          
Property, Plant and Equipment [Line Items]                          
Property and equipment, useful life                 5 years        
Vehicles [Member] | Minimum [Member]
                          
Property, Plant and Equipment [Line Items]                          
Property and equipment, useful life                 3 years        
Vehicles [Member] | Maximum [Member]
                          
Property, Plant and Equipment [Line Items]                          
Property and equipment, useful life                 7 years        
Decontamination And Processing Equipment [Member] | Minimum [Member]
                          
Property, Plant and Equipment [Line Items]                          
Property and equipment, useful life                 3 years        
Decontamination And Processing Equipment [Member] | Maximum [Member]
                          
Property, Plant and Equipment [Line Items]                          
Property and equipment, useful life                 7 years        
61-90 Days Past Due [Member]
                          
Accounts Receivable [Line Items]                          
Percentage of reserves for doubtful accounts receivable (in hundredths)                 5.00%        
91-120 Days Past Due [Member]
                          
Accounts Receivable [Line Items]                          
Percentage of reserves for doubtful accounts receivable (in hundredths)                 20.00%        
Over 120 Days Past Due [Member]
                          
Accounts Receivable [Line Items]                          
Percentage of reserves for doubtful accounts receivable (in hundredths)                 40.00%        
Deemed Uncollected [Member]
                          
Accounts Receivable [Line Items]                          
Percentage of reserves for doubtful accounts receivable (in hundredths)                 100.00%        
[1] No impairment losses have been recorded.
[2] As presented in the accompanying consolidated financial statements contained herein within this Form 10-K/A – Amendment No. 1.
[3] Net of taxes of $1,276,000 for year ended December 31, 2011.