XML 45 R30.htm IDEA: XBRL DOCUMENT v3.8.0.1
Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
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 Perio
d
    
Charged to
Profit and
Los
s
    
Deduction
from
Reserve
s
    
Balance at
End of
Perio
d
  
Year Ended December 31, 2017
:
                                
Allowance for doubtful account
s
   $
515
 
   $
637
     $
(675
 )   $
477
 
Valuation allowance for deferred tax asset
s
    
8,217
 
    
2,196
      
-
      
10,413
 
                                 
Year Ended December 31, 2016
:
                                
Allowance for doubtful account
s
   $
751
(1)
   $
295
     $
(531
 )   $
515
 
Valuation allowance for deferred tax asset
s
    
7,057
 
    
1,160
      
-
      
8,217
 
                                 
Year Ended December 31, 2015
:
                                
Allowance for doubtful account
s
   $
755
(1)
   $
416
     $
(420
 )   $
751
(1)
Valuation allowance for deferred tax asset
s
    
1,858
 
    
5,217
      
(18
 )    
7,057
 
 
(
1
)
Includes amounts that were classified as held for sale.