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Schedule II
 12 Months Ended
Jan. 31, 2019
Notes to Financial Statements  
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Schedule II
Perma-Pipe International Holdings, Inc. and Subsidiaries
VALUATION AND QUALIFYING ACCOUNTS
For the Years Ended
January 
31,
 
2019
 and
2018
 
(In thousands)
 
Balance at beginning of period
  
Charges to expenses
  
Write-offs (1)
  
Other charges/ (reversals) (2)
  
Balance at end of period
Year Ended January 31, 2019
                                        
Allowance for possible losses in collection of trade receivables
   $
469
 
   $
140
 
   $
(272
)
   $
199
 
   $
536
 
                                         
Year Ended January 31, 2018
                                        
Allowance for possible losses in collection of trade receivables
   $
305
 
   $
247
 
   $
(135
)
   $
52
 
   $
469
 
 
(
1
)
Uncollectible accounts charged off.
 
(
2
)
Primarily related to recoveries from accounts previously charged off and currency translation.