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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
SEC Schedule, 12-09, 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, 2018:
                                
Allowance for doubtful accounts
   $
477
 
   $
449
     $
(266
 )   $
660
  
Valuation allowance for deferred income tax assets
    
10,413
 
    
1,785
      
(2,765
 )    
9,433
  
                                 
Year Ended December 31, 2017:
                                
Allowance for doubtful accounts
   $
515
 
   $
637
     $
(675
 )   $
477
  
Valuation allowance for deferred income tax assets
    
8,217
 
    
2,196
      
-
      
10,413
  
                                 
Year Ended December 31, 2016:
                                
Allowance for doubtful accounts
   $
751
 
(1)
   $
295
     $
(531
 )   $
515
  
Valuation allowance for deferred income tax assets
    
7,057
 
    
1,160
      
-
      
8,217
  
 
(
1
) Includes amounts that were classified as held for sale.