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Schedule II | 12 Months Ended
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Jan. 31, 2020
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, 2020 and 2019
(In thousands) |  | Balance at beginning of period |  | Charges to expenses |  | Write-offs (1) |  | Other charges (2) |  | Balance at end of period
Year Ended January 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for possible losses in collection of trade receivables |  | $ | 536 |  |  | $ | 123 |  |  | $ | (254 | ) |  | $ | 2 |  |  | $ | 407 |
Year Ended January 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for possible losses in collection of trade receivables |  | $ | 469 |  |  | $ | 140 |  |  | $ | (272 | ) |  | $ | 199 |  |  | $ | 536 |
( 1 ) Uncollectible accounts charged off. ( 2 ) Primarily related to recoveries from accounts previously charged off and currency translation.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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