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Schedule II Allowance for bad debt (Tables) | 12 Months Ended
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Jan. 31, 2018
Valuation and Qualifying Accounts Disclosure [Line Items] |
Summary of Valuation Allowance [Table Text Block] |
(In thousands) | Balance at beginning of period | Charged to costs and expenses | Deductions from reserves (1) | Charged to other accounts (2) | Balance at end of period
Year Ended January 31, 2018 |  |  |  |  |
Allowance for possible losses in collection of trade receivables | $305 | $247 | $135 | $52 | $469
Year Ended January 31, 2017 |  |  |  |  |
Allowance for possible losses in collection of trade receivables | $33 | $246 | $1 | $27 | $305

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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration