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Interest expense, net | 9 Months Ended
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Oct. 31, 2017
Interest Income (Expense), Net [Abstract] |
Interest Income and Interest Expense Disclosure [Text Block] | Interest expense, net.
| Three Months Ended October 31, | Nine Months Ended October 31,
| 2017 |  | 2016 |  | 2017 |  | 2016 |
Interest expense |  | $225 |  |  | $164 |  |  | $583 |  |  | $556 |
Interest income | (32 | ) | (52 | ) | (76 | ) | (121 | )
Interest expense, net |  | $193 |  |  | $112 |  |  | $507 |  |  | $435 |

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- Definition The entire disclosure for interest income and interest expense for enterprises that derive a significant portion of their revenue from interest collected on investments, loans, and securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-12) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- References No definition available. + Details
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