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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract]  
VALUATION AND QUALIFYING ACCOUNTS VALUATION AND QUALIFYING ACCOUNTS

Schedule II

NORTHWEST PIPE COMPANY

VALUATION AND QUALIFYING ACCOUNTS

(Dollars in thousands)

 

                                 
    Balance at
Beginning
of Period		     Charged
to Profit
and Loss		     Deduction
from
Reserves		     Balance at
End of
Period		  

Year ended December 31, 2012:

                                

Allowance for doubtful accounts

   $ 1,650     $ 1,381     $ (1,283 )    $ 1,748  

Valuation allowance for deferred tax assets

     926       14       —         940  
         

Year ended December 31, 2011:

                                

Allowance for doubtful accounts

   $ 2,151     $ 3,518     $ (4,019 )    $ 1,650  

Valuation allowance for deferred tax assets

     105       872       (51 )      926  
         

Year ended December 31, 2010:

                                

Allowance for doubtful accounts

   $ 793     $ 3,118     $ (1,760 )    $ 2,151  

Valuation allowance for deferred tax assets

     470       —         (365 )      105