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Other intangible assets with definite lives (Tables) | 9 Months Ended
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Oct. 31, 2017
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |
Patent amortization expense [Table Text Block] |
| Three Months Ended October 31, | Nine Months Ended October 31,
| 2017 |  | 2016 |  | 2017 |  | 2016 |
Patent amortization expense |  | $12 |  |  | $12 |  |  | $34 |  |  | $34 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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