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Other intangible assets with definite lives (Tables) | 9 Months Ended
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Oct. 31, 2015
Other intangible assets with definite lives [Abstract] |
Patent amortization expense [Table Text Block] |
| Three Months Ended October 31, | Nine Months Ended October 31,
| 2015 |  | 2014 |  | 2015 |  | 2014 |
Patent amortization expense |  | $14 |  |  | $13 |  |  | $40 |  |  | $38 |

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- Definition Other intangible assets with definite lives [Abstract] + References No definition available. + Details
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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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