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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2015
Notes to Financial Statements  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
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, 2015:
                                
Allowance for doubtful accounts
   $ 755     $ 416     $ (420 )   $ 751  
Valuation allowance for deferred tax assets
     1,858       5,217       (18 )     7,057  
                                 
Year ended December 31, 2014:
                                
Allowance for doubtful accounts
   $ 685     $ 411     $ (341 )   $ 755  
Valuation allowance for deferred tax assets
     1,894       26       (62 )     1,858  
                                 
Year ended December 31, 2013:
                                
Allowance for doubtful accounts
   $ 1,748     $ 124     $ (1,187 )   $ 685  
Valuation allowance for deferred tax assets
     940       954       -       1,894