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VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract]  
VALUATION AND QUALIFYING ACCOUNTS
SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS
 
MARINE PRODUCTS CORPORATION AND SUBSIDIARIES (in thousands of dollars)
 
   
For the years ended December 31, 2012, 2011 and 2010
  
Description
  
Balance at
Beginning
of Period
    
Charged to
Costs and
Expenses
    
Net
(Write-Offs)/
Recoveries
    
Balance
at End of
Period
  
Year ended December 31, 2012
                        
Allowance for doubtful accounts
   $ 27     $ —     $ (5 )   $ 22  
Deferred tax asset valuation allowance
   $ 3,783     $ 372     $ —     $ 4,155  
Year ended December 31, 2011
                                
Allowance for doubtful accounts
   $ 31     $ —     $ (4 )   $ 27  
Deferred tax asset valuation allowance
   $ 3,677     $ 106     $ —     $ 3,783  
Year ended December 31, 2010
                                
Allowance for doubtful accounts
   $ 36     $ —     $ (5 )   $ 31  
Deferred tax asset valuation allowance
   $ 3,459     $ 218     $ —     $ 3,677