Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details Narrative)

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Commitments and Contingencies (Details Narrative) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
May 01, 2017
Jun. 30, 2003
Dec. 31, 2017
Dec. 31, 2016
Interest income, other     $ 140 $ 110
Letters of credit outstanding, amount     2,675  
Bond outstanding     8,305  
Operating leases, rent expense     754 735
Perma-Fix Northwest Richland, Inc [Member] | Standby Letter of Credit for New Bonding Mechanism [Member]        
Debt instrument, collateral amount     2,500  
Perma-Fix Northwest Richland, Inc [Member] | Standby Letter of Credit for New Bonding Mechanism [Member] | Lender [Member]        
Line of credit facility reduction, additional reduction     750  
American International Group, Inc [Member]        
Period of finite risk insurance policy   25 years    
Maximum allowable coverage of insurance policy     39,000  
Financial assurance coverage amount under insurance policy     29,473  
Financial assurance coverage, amount of reduction during period     9,711  
Sinking fund related to insurance policy     15,676 15,546
Interest earned on sinking fund     1,205 1,075
Interest income, other     $ 130 86
Insurers obligation to entity on termination of contract     100.00%  
American International Group, Inc [Member] | Perma-Fix Northwest Richland, Inc [Member]        
Interest income, other     $ 10 21
Interest earned on sinking fund under second insurance policy       241
Release of the sinking fund related to second the insurance policy $ 5,951      
American International Group, Inc [Member] | Perma-Fix Northwest Richland, Inc [Member] | Credit Facility Secured by a Bond [Member]        
Financial assurance coverage amount under a bond     $ 7,000  
American International Group, Inc [Member] | Other Noncurrent Assets [Member] | Perma-Fix Northwest Richland, Inc [Member]        
Sinking fund related to second insurance policy       $ 5,941